Chris is used even more than Leon, he was just in RE5, RE6, RE7, and rumor has it RE8, that is four I repeat FOUR mainline games in a row, I honestly can't understand how Leon being in RE8 would bother someone because he is used "to much" while Chris gets a free pass even though the last 4 main titles in a row has had him a a main character, at least Leon got a break in between main titles such as RE2, RE4, RE6 etc.
Fact is storyline wise (not counting Vendetta) we haven't seen Leon since RE6, would be interesting to see Capcom's take on a older Leon in the RE engine.
I understand that Chris is also used a lot which is why I said I can't really explain why it bothers me so much that Leon is used as opposed to Chris. To be honest I don't like either of them all that much and I guess I just find Leon to be annoying in everything after Resident Evil 2. I don't like what they've done with his character and I feel like he's a glorified poster boy. If Resident Evil 8 was his last appearance, I'd be perfectly fine with that. I just don't like him.