I have some thoughts after playing Legion Remix about things Blizzard could consider to make the game better, more compatible, and allow people to have fun.
I like having difficulty scale, not with character level, but by item level. Rather than having a set difficulty for lfr, normal, heroic, mythic, ludicrous speed, but have the difficulty scale based upon the average item level of the person or group and this would also introduce new mechanics organically rather than having them thrust upon you.
Set item level requirments for different tiers of difficulty, for example to raid normal, you must have a minimum level of x, etc. Here is where it changes from how things are done today. The higher the groups item level goes, the instances continue to add new wrinkles that will be in the.next tier of dificulty,.but are more forgiving than they will be in the next tier.
For things like lfr, you make it so only people with similar item levels are put in the same raid group, dungeon , etc.