Trainerroad + Game of Thrones + Kickr = Quality long rides no problemo. Even better than outdoor riding in terms of quality - you can reliably ramp up your TSS, power targets, etc., so you're not stagnating week after week, as typically happens with a lot of folks who aim to improve but just 'ride somewhat hard' on their long rides.

Long rides indoors are like death though without the objective numbers telling you how you're faring as well as a video or other AV thing to occupy your mind.