Great points. Love Hina definitely introduced (or at least popularized) lots of now standard shonen harem tropes, especially studying and the "mystery girl".
I'd still consider Love Hina a "Magazine-style" harem, despite having some "Jump-style" elements like having a main love triangle within the harem. To me, the core structure of Love Hina is still based on Keitaro being the outsider (he's crashing into the girls' lives), whereas in "Jump-style" harem, the female lead is the outsider (Lala/Chitoge/etc is crashing into the Rito/Raku's life and making him re-evaluate his love for Haruna/Onodera/etc). In order words, "Magazine style" is about how the arrival of the male MC changes the status quo, whereas "Jump-style" is about how the arrival of the female lead changes the status quo. Eg To Love Ru's whole premise is built on how Lala's presence led to other aliens interfering with daily life.
The other big difference is that Love Hina and "Magazine-style" harems start with an extreme gender imbalance, which makes them very harem-y from chapter 1, whereas "Jump-style" harems seem like normal romcoms when they start. This baits in a lot of people who don't like harems and results in a lot of angry people later on who hate the series turning into a harem.
I'd consider Love Hina the trope codifier for "Magazine-style" harems while Urusei Yatsura is the trope codifier of "Jump-style" harems for popularizing the styles, despite both not completely following them. In fact, "Jump-style" is perhaps a misnomer entirely, since it's really To Love Ru and Nisekoi that follow it strongly while many other Jump harems don't. Bokuben sort of shares some aspect of it (having 2 main heroines from the start), but there's no core love triangle nor a main "outsider" girl, so it doesn't capture the central tension that "Jump-style" harems are built on. Yuuna-san I'm not that familiar with, but doesn't seem to have any romantic tension at all either. Perhaps it's because Jump is abandoning romantic drama (and thus "Jump-style" harems) in its post-Nisekoi harems that Cuckoo and WSM were able to find an opening.