Way over the top. You make it sound as if he's worse than Douglas. I get it. You don't like the player. You still have to give him some credit. Even the journos on Sport and MD, who used to bash him non stop last season think he's improved a lot this season.
He's improved but he's still not good enough to be a backup. It takes more than basic conjecture of he was "solid" or "acceptable" to make a case for Gomes. When he's literally the worst possible in the squad in nearly every significant statistical area (Goals/assists/key passes/fouls/turnovers per 90) then it really should raise a lot of red flags. Letting an output like that slide by is just not acceptable. I'll give him the credit of not being as bad as he was last year, now he can exist in the system without looking completely overwhelmed in every situation. But he still has shown nothing truly positive and earned no merits at all.
Other elite teams have the likes of Kovacic/Bernardo Silva/Gundogan/Tolisso coming off the bench. Those are elite backups. There's at least 3 tiers if not more between them and Gomes who is functionally useless to sub on and change/impact a game. What does he bring of value when he comes on? Creativity? Energy? Defensive solidity? Practically nothing, he plays like a placeholder who's just there to fill the 11th lineup spot. On his good days he'll be irrelevant and a plain performance with little to add. On his bad days he's an utter liability everywhere on the pitch that can singlehandedly sink your team's effort to win.
The hierarchy of playing time should be:
Starters->productive, well-rounded backups->niche bench players that can come on and bring something of value->developing youth players.
Why rotate with a player that has no use currently to win the game or in the long term future?
Luckily enough with Coutinho now our midfield options off the bench (Iniesta or Raki) improve greatly and Gomes will see less time. This summer too if we get Arthur and/or as Aleña makes his jump then Gomes' role will diminish greatly. I refuse to believe that when the squad is healthy Gomes can keep persisting with this much playing time performing so poorly.