i don't think they should change the default amount of special saved just because losing exactly 50% by default is very logical and intuitive. they should maybe just nerf how effective 1-2 subs of it is, so that if you really want the bonuses of special saver you have to invest more resources into it, since i don't really think it's quite on the same level of ink resistance or quick super jump of "the game feels bad to play if you don't have it"
similarly it would be pretty dumb to make the player have some sub-resistance by default, because like... why wouldn't they just change the amount of damage the subs do directly? making the player inherently have a small amount of damage resistance would make everything extremely unnecessarily confusing, because that effectively means bombs do more damage in the training room than they'd actually do in a match
though that being said, my own take is that damage resistance abilities (excluding ink res since that's more movement-related than damage related) are dumb and shouldn't exist. we've gone from Defense Up in splatoon 1, to Bomb Defense Up in splatoon 2, and now Sub Resistance Up in splatoon 3, and they've all gradually become less effective than their predecessor, and i think that's because it's just a flawed idea in the first place. if the devs don't want 3 hits of a fizzy bomb to be lethal, then they should just change its damage, rather than make it so that it can be safe if you happen to have even a single sub of this ability. it's a really bizarre way of balancing sub weapons that feels like it's done just so they don't have to commit to a big change more than any real balancing reason, and i would be very pleased if splatoon 4 entirely scraps sub resist in favor of just tweaking any damage values they don't like
aside from that i generally like the system and think it's pretty cool. i wish food tickets were more reliable at providing certain abilities, but i think the rate you're able to get them feels fine enough. i don't think there's any particular abilities i think need to be nerfed directly (other than maybe special saver like i mentioned earlier, but i think that's better for a new game because of how much current gear is built around it), but it would be nice to see eg. stealth jump's effect is partially applied to regular jumps too so that it's less necessary to run stealth jump, and for thermal ink to get buffed to apply to more indirect sources of damage like blaster indirects. also i don't like respawn punisher and will be very happy if that ever gets reworked or replaced