Unless you’re doing 25s or higher, you don’t need to concern yourself with meta.
Play what you enjoy, and if you hit a point where you feel like your class or spec choice is what’s limiting you from pushing higher, then start focusing on meta each season. Far too many people concern themselves with meta when even they themselves know they won’t be doing keys at a level where meta becomes required. You’re essentially playing meta, and not what you actually enjoy, just to fool people into inviting you to their key.
Not getting invites because you aren’t playing meta feels bad, I’ll agree… but there is nothing blizzard can do to fix this. There will always be a best, and even if it’s by 0.1% this community will act like it makes or breaks their +18 key. Blizzard can’t fix the majority of their player bases idiotic mindsets