If you look back the past 20 years, and specialy the late 2000s with 2020 you'll find that the early-mid 2010's was all about pedophile bait(Eromanga sensei, Oreimo) and these days it is all about either high quality originals/adaptations with mass appeal(Your name, Kimetsu, AoT, Fate spinoffs) or isekai trash copy-paste.

Anime is not static, there have been significant trends that died off, e.g moe-slice of life(of 13yo girls) during Kyoto's golden era(K-On, Haruhi), these days that genre is almost dead.

In general I'd say these days it is pretty unlikely something like Oreimo would be consistently the most popular of the season again. Does that still exist? Sure go on MAL and see the bottom of the barrel of each season and you'll find some common trends. But if the question is if its changing, yeah I believed it changed quite a bit, if not because of cultural change but because of appeal to broader Westerner/Chinese audiences due to streaming.