It's interesting, whenever someone tries to come to his defense this is the usual stuff they say. For some reason nobody even considers mentioning what he actually brings to the team. Every player we have on the bench can bring something different to the team that can help, and those that don't are often ridiculed for not being good enough. Just think of any non-Pedro bench player and think of what said player brings to the team. If you can't think of anything, chances are they aren't playing all too much (Adriano, Montoya, Douglas, Roberto, etc). Why is experience the only thing you have chosen to say here when trying to argue a point for Pedro? Is it because, beyond his intangible experience (Which he usually uses to either vanish completely or miss sitters) he doesn't really have much to offer? Why doesn't anyone say Messi or Busquets deserve to play because they, too, are experienced?
It truly does not matter who is better between him and Munir/Sandro. I could argue with you over the fact that Sandro is much more of a goal threat than Pedro but that's besides the point. Pedro is so incredibly ineffective that playing a young forward would not hurt us any more than having him start would. An injury to one of our front trio would spell disaster and having Pedro there instead of Munir or Sandro won't make things even a small bit better for the team. The difference is, Pedro is 28, while our two newly promoted forwards are 20. Pedro will not improve; in fact, if you look at a chart of his year to year performances he'll actually get worse. Munir and Sandro, on the other hand, have a ton of learning and growing to do. Those 15 minute cameos Lucho often gives Pedro that clearly don't satisfy his desire to play would mean the world to the development of a young player trying to integrate into the first team.