Lewandowski and Depay are no match of course. Lewandowski has been one of the best strikers in football history. Therefore it isn't too hard to understand why Bayern Munich aren't very willing to let him go now. Because he can still be very useful and even continue be the top scorer in the Bundesliga. But I'm afraid they are very likely to lose him this summer as it seems. Barcelona seem to be the closest team to sign him now as far as I can see. Chelsea are rumoured to make an effort for him too but Barcelona could still be one step ahead.
Lewandowski has established so much for the team, and if Bayern Munich would lose him now then this is going to be a crucial season for them, of course, we can not compare Robert Lewandowski's Achievements to Memphis Depay because Depay is just getting started and needs to achieve more in order to become like Lewandowski, and right now Bayern Munich would likely to lose Lewandowski this summer right now Bayern and Lewandowski is not in good terms right now so that it Barcelona was the team Lewandowski would likely want to be,
Lewandowski contribution to Bayern Munich has been quite large so far, even at his current age Lewandowski has not shown a decline in performance in the game, so it's only natural that he is still priced quite expensively by Bayern Munich if there are other teams interested in buying him, 50 million euros for the player 34 years old, of course, is not a reasonable price, but it seems that it is one way for Bayern Munich to keep Lewandowski from being chased by other teams, with one year remaining on his contract it looks like Bayern Munich are ready to lose Lewandowski for free in 2023 later.
Robert Lewandowski is really exceptional but his age is not that old enough to hinder him to play football, I guess his price was very reasonable, but it is still up to Robert Lewandowski if he wants to stay for Bayern Munich or not, so Bayern Munich is keeping the price high for Lewandowski, but I think Barcelona is willing to pay that high so they can get their hands on Robert Lewandowski,