Actually everything that you said is wrong at some point in high level content.
There are multiple examples in the last fights where you will lose your buffs if you don't chose the good rotation in M4S or FRU.
Gauge management is also not trivial if you want to optimize it, again in M4S or FRU where you can use it at some point or others for many reasons.
Those are some reasons why the viper is actually not boring to play, even though i also absolutely think that the current state of his combo system is a shame, having only a 4 combos loop on the viper is clearly not what is meant to stay and I hope they patch this soon.
I feel like people who complain about the removal of noxious gnash never experienced it and don't know what they are talking about. This debuff was not a 1/10, it was heavensward headache level, i don't think removing it entirely was the best option but it clearly made things better than before. I played viper a lot during this month and i know that any situation that was not just plain single target full uptime was an absolute pain. AOE ? Terrible. Target swap ? Terrible. Lose uptime ? Terrible.
You people just don't wanna accept that this game's difficulty has shifted, it went from job complexity to fight momentum and rythm(which in turn make them harder). You want a job to feel complex even in easy fights, but back in the days, jobs were so complex that there was no way to make the fights faster/harder because jobs were already overwhelming. Right now, people that found the game too hard before might feel confortable to try some harder content thank to the job's simplification, that is huge.
I think in the current state of the game, except for his combo system(and his bad dps and unbalanced uncoiled fury), viper could be better but is really not bad. I think the game is in the best state it has ever been, the last fights are among the best this game and any game has ever made. People are free to keep complaining if that's not the state they want the game in, but it's annoying seeing people talking like their opinion is "objectively" better in a lordly manner because they think job complexity is more important, I don't feel this way and pretty sure a lot of people don't feel this way either.