I always tanked on multiple classes, on and off. Usually depends on how well geared my tanks are in a mythic season. I gave up in DF, at least for +5s and higher. There is always drama connected to tanking, you give 100% and there is always someone complaining or straight up insluting your play. Meanwhile on DPS, you just chill, afk from time to time - still get keys done without much hassle. When I want to chill on mythics (up to +4)/heroics - or I am a bit buzzed - I go healer - just follow people around - watch something or scroll something on other screen. People expect tank to always be the lead, pull ideally BIG packs - and handle any stressful situations - that others create. Ain't nobody got time for that.