You answer yourself there mate, IMO the team should be composed from starting XI quality, challenging squad players that can take the starting spot if needed and promising youngsters.
Pereira does not fit any of those descriptions, he is not starting quality, he isn’t a squad option that can challenge for the starting spot (or at least shouldn’t if we are to compete for titles again) nor he is a promising youngster.
He is just taking minutes away from youngsters that may actually become good.
I know we are sentimental because he comes from the academy but Pereira is a really really average player that will become 24 shortly so it’s highly unlikely he’ll get to the required level.