ah! i see! crossdressing!harry is not my thing either ( and in many cases crossdressing!snape as well although i know some excellent exceptions ...)
i always had the theory that chan and detention fic is popular with those who had been snarry-fans from the first hour, meaning 2003, 2004, when harry played by dan radcliffe was still a child.
because i started the whole series when it was already finished i also have difficulties with 16 year old harry - in my imagination he is already grown up and has three kids.
what about fics that are written NOW - post dh - but ignore canon from let's say, poa. or gof?