Has there been one of these before where the Mc just accepts it out right, or at the very least doesn't shit his pants? Its not that I hate it but the flustered and introvert route just seems to be like beating a dead horse anymore
There's three things to keep in mind here.
1. Self insert bullshit: The author knows his readers are, by and large, fucking turbonerd NEETs who would never even ask a cute girl out. Thus the reader self-insert needs to be equally inept, but also have next to no personality aside from being "nice", which is a trait anyone can have with zero effort.
2. Money: If the reader self-insert was like "fuck yeah lets bump uglies" in chapter 2, it'd be a short manga, and the author, like other manga authors, wants to serialize this and have it go for years and have 5 animes and shit so they can make huge cash.
3. Finally: The ones with the guys that accept it outright exist, it's just they're all H-doujins because lets be real, seggs.