I dont care what you used to do, claiming that M+ is more difficult than Mythic raiding is objectively false. In raiding you need to recruit and maintain a guild of at least 20 competent people who you then need to organize and lead in a raid where you then also need to figure out a strategy for a boss that works for you group. Meanwhile in M+ I just need 4 of my friends where the only change in difficulty is that numbers are higher with no change in mechanics, oh gosh that is so hard.
I dont even have to make these point, we can literally check the stats for how many people have completed M+15 versus completing the latest mythic raid and the numbers will speak for themselves. Do the content you enjoy, stop seeking validation for it like it matters.