As a long-time FF fan, you're describing my experience. FF13 really was the turning point. I've never been able to get past 4-5 hours into it. The demo for Lightning Returns made me decide to never play it. I have FF15 but have never played it. Having to go outside of the game to get the full story is a huge turn-off. , I'll eventually play 15 and 16, but the series seems to have just been all over the place for years now. As for VII Remake, there were so many comments stating that people just wanted a simple remake - not a re-imagining. It makes sense that those people wouldn't pick up the second part. For my part, I haven't played it but likely will one day - but Nomura makes me far less interested. Just not a fan of his.
I have been a big Final Fantasy fan since the days of the SNES. The turning point for me was Final Fantasy 12. I couldn't get into the combat and story of that game. I was excited for Final Fantasy 13 but, again, it really did not click for me. Then, Final Fantasy Versus was finally released as FFXV, but I really never cared for it. Final Fantasy XVI, however, did bring back the enjoyment I had for FF games and I had a great time with it. It has its flaws, but overall, I felt like I was playing a FF game back when I loved them.