Personally, I don't mind the so-called slow updates. I don't mind old weapons being released slowly. It is a good thing to keep new players interested and it also makes things less stale for older players. And I speak as someone who played the original Splatoon from day one.
There are plenty of weapons in the game already. If anything, the poor gear variety is far more bothersome.
I do mind the slow updates to be honest, in Splatoon 1 at this point in time (4 months from launch) we were getting double weapon updates fairly regularly, we had our massive 2.0.0 update in August (2 and a half months after launch) and the game was being pretty well supported. It's an even bigger slap in the face to us veterans of the first title because Nintendo sold this game to us as "it has more content than 1 at launch and will have even more after all the updates!" which has been a bit of a lie thus far.
Yes we had more weapons and maps at launch (8 vs 5, Sloshers, Splatlings and Dualies at launch), but as of this point in time Splatoon 1 is tying 2 for maps, both have twelve 4 months from launch, both have the same 3 ranked modes, both have Level 50 and S+ as caps, but Splatoon 1 was more generous with weapon gifting (23 vs 17) and maps (7 vs 4, but granted this is from the 5 vs 8 starting maps). On top of that, we had a gear update and all 12 maps stuck out with designs and felt very different to play.
In Splatoon 2, The Reef, Inkblot, Starfish, Musselforge and Sturgeon are all basically the same map (square design with raised or lowered mid). Humpback and Blackbelly are very similar in design choice, no-one really likes Port and Moray so this leaves us Snapper Canal, Kelp Dome and Manta Maria. In Splatoon 1 we had Urchin, Walleye, Saltspray, Blackbelly, Arowana, Port, Kelp Dome, Bluefin, Moray, Triggerfish, Flounder and Hammerhead. Look at that diversity difference, because Splatoon 1's maps all had their own theme and layout structure to make them FEEL different, Splatoon 2 has very forgettable samey maps.
At this point in time their "generous" claim of 1 year of content updates is nothing more than a "we want weapon and map releases to be slow and painful whilst you get bored of this game" claim. If this game is due to have more maps and weapons than Splatoon 1, where are the double weapon releases? Where are the new maps? Where's the gear? Where's a new and unique ranked mode? This game has earned its status as Splatoon 1.5 because the devs simply haven't put enough effort in to MAKE it a 2nd game. This is where our frustration has kicked in.
The game is stale because the maps aren't different enough, the weapons aren't coming quick enough and we still don't have a very interesting or enjoyable meta because the devs have refused to do proper balance updates unless they've been forced to because of blatant issues (Tri-Slosher, Inkjet, Ink Armor, Baller etc.). I have 205 or more hours on the Switch play log, and I barely play anymore, I've seen all this content in Splatoon 1 (ignoring new weapons, Salmon Run and new weapon kits) and it's just dull now. I hop on for Splatfests and new weapon releases when they're interesting, but the game hasn't done enough to keep me interested the way Splatoon 1 did. This is in part to us having experience with the first and this being a carbon copy (thus already being bored of Splat Zones, Tower and Rainmaker), which isn't helping matters. Then to be told to wait 4+months just to get access to a weapon that was in the first game already is too much for some who still don't have their mains or are waiting for alt kits because their main has a trash kit.
This became a giant rant, wasn't entirely aimed at you though but holding back content is a much better way of making it grow stale faster than having most of the weapons already available. Think about this, if 60 of the 80 weapons were at launch (number for arguments' sake) we'd be going from one thing to the next and the next spending a good chunk of time on every weapon whilst ranking up you'd take longer to rank up and longer to grow bored. If we have 20 of 80 with the following 60 coming out one a week for 60 weeks we get our promised year of content, but we use the one meta weapon already in (Splattershot), get to S/S+ with ease, play a weapon that releases on a Friday/Saturday for 1 hour and then junk it because it most likely sucks. It means you get to the "end" of the game before it's even done updating because you're at Level 50, at the best rank (who cares about the numbering system in S+?) and bored because the game is hiding the rest of the maps and weapon from you to avoid "overwhelming" newcomers. I'm just hoping this November patch is giving us the 2.0.0 style update and that we'll be seeing a new Nintendo Direct either this week or next, because one of those should be due soon. Meanwhile I'll be lurking in the shadows waiting for the game to have enough content to come back to it properly.