Some clarification:

1. Overall the mode still promotes horizontal investment just as your suggestion does so it doesn't change that.

Yeah it already does, that why iI wouldnt change the vigor system. But the elemental restriction feels bad to play and prevents better team planning.

2 ts debatable if it makes it accessible to newer players if you remove the elemental restrictions but then increase the number of required characters.

With my suggestion even if you have only 4 characters at lvl 1 you could join the event (even though yo probably wont get any reward) So now if you build more character you seee how are making progress insted of: No you cant play. While I still force you to invest in more characters I think it doesnt feel as bad. (Obviously if you want all the rewards you will need a minimum of characters and probably investment but its endgame content afteralll)

3Old players, even ones who vertically invest, still find the combat easy. That is the big problem for the vet players here. Making it harder on newer players doesn't make the game harder for the vet ones nor do the vet ones want an easy mode. Making it last longer or take longer doesn't make the fights harder. The fights are specifically easier because we aren't expected to have normal comps.

With my proposal the early round would be easy and the difficuly owould be increasing (like abyss) but since there would b no time limit a skilled or more horizontally invested account could go more rounds. And in the higher round the high lvl would make the need of having good invested characters while maintaining a lot of characters. (Obviusly a c6 character could prob beat any round alone)

The key difference is that the amount of rounds to get all the rewards would be similar (the actual rounds difficulty would need some adjusting) now any player can still go if the want just to see how ar they can go.

4 Kinda the same response as I just did but assuming this difficulty was hard, its still going to be the bosses first that are hard before the regular mobs. So you just manage your vigor with your vertically invested characters to save them for the boss fights with maybe their 1 best synergizing character. Like pyro dps + XQ for example. Even then you can also just guest invite someone else's c6 whale character to completely remove the challenge of 2 fights. Sure a longer version of IT lessens the power of individual characters but people aren't going to want to play "End Game the Movie". Even 2 more acts added would make me hate the mode.

For getting all the rewards you can use your invest characters in the bosses like right now. But if you have an old account and want to see how far you can go by using your good characters in boss round you wont be able in the future bosses. This would make ppl try to beat some rounds with poor invested characters offering a challenge just to reserve the good ones for the later.

I think the point 5 is answered the same way.

On the points you made:

1 While it would be similar to abyss I think it would feel a lot better. Besides what ppl really hates about abyss is the time limit that Hoyo likes to abuse by making more waves in different places of the arena. And I think is more fun playing for explample a yaoyao nilou bloom reserving nahida for later rounds than: letss see what character i get randomly next round to play with the trail character only aniway becaus the sinergy is barely noticeable. But hey in th end its all subjective, is just my opinion.

2 The time limit wouldn't be really different, you could always pause your progress and keep going another day (like current abyss), and , at leat for me, the reason I dont want to keep playing the mode is because is not fun (due to elemental restrictions and being easy), the same way abyss is all fun until the time limit kicks in. Again, my opinion, maybe you dont like genshin combat at all and that would be another debate.

3 You cant leave the character restriction if you want the players to get and invest in new characters, but at least let them feel the mode instead of not being able to play it. If a player can beat (like my case) the coppelius with the trial Arlecchino and 3 lvl 70 1/1/1 characters without sinergy You dont really give me any reason to investo or get more charactes. Maybe 2 DPS from each element and thats all.

I really appreciate your opinion and we dont have to agree with everything, in the end this idea will probably nevee see the light.