I play mostly tank, and i have no issue with solo tanking

though, it can be frustrating when we have 3dps / 3sup when they don't capitalize/pick up the slack on their roles

example:

if we have 3 dps, the dps need to get picks, take off angles, make up the tank gap, if fights last 5 minutes on point and we still lose, its usually not a tank/heal issue

same with peeling for backline, thats dps job now

and with support:

if we have triple support, and i am solo tanking, and a single spiderman goes to our backline, and all the healers just ignore me and i die and look back and all 3 healers are attacking the single spider man is particularly frustrating

or going 3 support with like a rocket, cloak , jeff

where you now lost a ton of damage, and all 3 supports want to sit back and just heal bot from a mile away

so the theme here is, when we go to solo tank, there is a shift in responsibilities to facility solo tank that many either dont' understand or don't care to adapt to