Alcacer is a significantly better player than Munir right now. Apart from playing regularly and scoring in La Liga, he also has a more than decent record in a competition like the Europa League and he's a similar profile to Suarez. Not to forget he's done very well for the Spanish National Team where he was the top scorer of their Euro qualifying campaign.
Munir has been here for the last two years and certainly not progressed much. Why would anyone think it's a better idea for him to ride the bench for another season? At Valencia he'll play regularly, which will benefit his growth. Just like with Samper.
Contrary to popular belief, just training with the best players won't contribute much to a player's progress. We still don't know the full details of the deal. For all we know, we might still have a buyback and if Munir does well, he will be brought back.
Just a couple of months ago, the consensus on this forum seemed to be that Munir isn't ready, while some claimed he wasn't good enough. A few great displays in pre-season games doesn't change that. Two entire seasons is enough to suggest that the current setup will continue to stall his development and he isn't good enough to make a significant impact from the bench which Alcacer has proved to be.
To say Munir is as good as Alcacer is ridiculous as he's not shown anything to suggest that yet.
Only if you're exceptionally talented like Busquets do you force your way into the team. Or having an impact like Pedro did in his initial games.
If you're not either of those things, then you need game time to develop and in the strongest Barca for a very long time, that's not easy to come by.
I love Pep, but did he give the likes of Gaudinho, Højbjerg regular chances at Bayern and keep them? No, he wanted them to be loaned out so they could gain experience, play regularly and develop properly before eventually coming back if they showed they were on the right track and good enough. Stop seeing him with rose-tinted glasses just because he gave Busquets and Pedro their chance. Busquets was an exceptional talent while Pedro showed enough impact to stay.