Let's forget about his age, Joselu is a good player but you guys forget something about how Ancelotti has been rotating his players. Since before now when Madrid hasn't gotten Mbappe let's say since the beginning of last campaign, has the coach been showing any sign of giving this guy Joselu a better opportunity? He always sit on the bench or sometimes he plays Joselu around 80-85mins just for him to kill the time, sometimes Ancelotti doesn't even play the guy so what's the assurance that he'll have a playing time (base on swapping the playing) now that they have Mbappe? To me Joselu is just there and there's no special reason for him to be there, if Ancelotti wants to do any sub he can even bring in a defender or a midfielder instead of Joselu.
Ancelotti did not give him a chance to start even after his goals in the semi-final against Bayern, so it can be said that Ancelotti is not changing his working strategy and there will always be a place for Joselu on the bench. Moreover, with the arrival of Mbappe, this situation will worsen, I doubt that Mbappe or Rodrigo will be on the bench. But apparently Joselu is happy with this, he goes on the field for twenty minutes, scores several goals, but he plays in Real Madrid, everyone makes their own choice.
Good thing you saw it the way I'm seeing it, to me that's disrespectful and I can't say he should be too comfortable with his (Joselu) situation at Madrid, I don't to see him as pawn in that squad but that's how it looks like. Let's say he's there for the achievement because no club stands a chance of getting all Madrid have gotten and will get in the nearest future. I'm even scared of Rodrygo getting less time of play since Mbappe is now part of the team, Ancelotti's plan might change and it will affect Rodrygo too, but let's see what will happen next season.