>>281175228 (OP)im sure theres some level of selection bias going on, but i have been reading novels for the past few years and harem endings are way more common in that medium.
i started with tsukimichi, where the mc has 2 wives,
then weakest mage of the zero believer goddes, where the mc has several girls by the end,
then book eating magician (also harem end),
then i remember reading "the kicked me out the party so i started partying with his mother" where the mc marries like 8 milfs,
then "main heroines are trying to kill me" (harem)
then i had to read mushoku tensei, obvious harem,
and now im reading "the extra's academy survival guide" which seems to also be aiming at a harem ending.
i get the feeling that harem stories dont make it through the filtering process when getting a manga adaptation unless you already have an established audience