Now, I would guess a large portion of rpg community probabily are final fantasy or elder scrolls players I would say there are few... very few rpg players that would survive this kind of learning curve only to enjoy this game...
I can tell, its completely worth it... but perhaps Larian should adress this as I can only immagine that are MANY, MANY "not so old school rpg players" that just need a bit more help to get into the genre...
There's a few of us around! For no especially good reason, I was quite a late-comer to RPGs (considering I've been playing video games on and off since the late '70s) and started with Oblivion. Which is fortunate for me, as in its vanilla form it's probably one of the more forgiving introductions to the genre, but I still found myself having a major case of "...?!" more often than not, until I eventually got it (and then came mods and complicated concoctions like FCOM, but that's another story).
Likewise, I started the Divinity series with Ego Draconis, which was again quite accommodating except for the minor element of being killed constantly if I didn't absolutely know what I was doing; so I did end find myself backing D:OS with some trepidation: I'd never played the old-style isometric, turn-based games and wasn't overly enthused by the fans of that particular style. So, yeah, I appreciate that it was definitely quite a learning curve, and unlike you am I not a good tactician, but it turned out to be a lot of fun.
It's a tough one: investing the time in something complex can be very rewarding, but if it seems too daunting, a lot of people won't bother. Fortunately, the Divinity series doesn't seem to be particularly afflicted by the sort of unwelcoming "lolnoob!" thing you see elsewhere, but I think the older-style of D:OS does certainly require a little determination for those unfamiliar with the playing style: which was at least my personal experience, anyway.
Starting with a "what not to do" guide sounds like it turned out to be a good plan though, and I think is one I should adopt for various things I need to learn too!