It's possible to just like both films though, I know I do.
I like TFA because it felt like right and felt like Star Wars. However I'm not blind to the fact that it's basically the same plot as EpIV but a few things juggled around. Doesn't mean I still can't enjoy it because of that. I think it was important TFA was like that though because it needed to land right, it needed to play it safe to make sure everyone got back on board after the prequels.
Having said that though, once we got that I was perfectly happy for the films to take a new direction. I still think TLJ felt like Star Wars but it was nice that it moved along to do it's own thing and we didn't just get a ESB clone.
I do agree with you that Disney fucked up by not having this trilogy worked out in the first place though and have a general overall story planned out.