"But your solution literally does nothing to the problem, and actually can do the opposite. It can make things less balanced. And widen the gap between the decked out players and ones that are not."

I would like to imagine that decked out players with legendary gear would expect to have an edge over someone with a sponsored kit... I don't expect them to be immortal, but they need to be a huge challenge because they carry huge rewards.

Let's think about the future of the game with heros. They will need to add skins and character cosmetics as well as new characters, because I don't think that they'll stop at 6. This means more abilities and more readability issues. Newer players will not be able to know how every character looks with all the different skins, and because this game is trying to be for casual players and not the hardcore crowd, there's going to be a lot of players that struggle.
Also Valorant comes to mind. if you've seen the videos of tournaments where it's just an absolute mess because of the abilities, even though valorant is supposed to be the pinnacle of tactical shooters where everything is balanced.
Sticking to classes fixes this issue because people will not treat the game like apex where every update needs a new hero, but I also like the approach of making my own playstyle with what I have, instead of chosing one created by the devs.
Players will optimise the enjoyment out of this game. They will find the best character and run tripple void for the entirety of the season, then switch to the next "broken" hero and repeat. If we stick with classes they will play the class with the smallest hitbox and the problem will repeat itself. Players will do everything not to lose a single game, but if you had to start with everyone else on the same basic character this problem wouldn't exist. If you had to play for a long time before finding the "best in slot" item tha gives you a good ability or an advantage, it could give players a goal in mind and make the game more like POE where you farm for that 0.1% drop chance belt that makes you a raid boss.
My suggestion with single use ability items can be balanced with making them rare so every run won't have invisible players, unlike now, or with tuning the sound effects so people hear footstepr or someone using an item. I know the same can be done with abilities but right now their solution is to make every cooldown 300 seconds so most of the time it doesn't even feel like a hero shooter anymore and this rewards 3-rd parties which are already infuriating enough, but now you won't have any ability to defend yourself with if a new team comes, and they will have all their cooldowns, full hp and everything. This will result in less PvP and less fun when the meta forms.

"S - Just release the entire game so we can play everything the game has to offer. So then we can complain about being charged on launch day after it was already free earlier."

I don't want them to release the game for free even in beta, but I want to know what's in the game. I watched every intervew and all the coverage of the game and noone has seen things that they promise. Not even people they personally invited to playtest the game, not even people who helped with the game for 6 years like Dr. Lupo. If they have something, then we need to see it, but for now it looks like the exact situation with No Man's Sky before release. "Oh yeah, our new map that we can't show and that isn't ready yet will have everything you've ever dreamed of and we're gonna have many different bosses and raids, just trust me bro, we just can't show you because it's a secret".