We also saw mines in both TvP and TvZ after the awful mine nerf in 2013 that wiped out Terran representation across the board, because they were still the best option that we had out of an incredibly rubbish bunch. Now, of course, it’s a different time, but the point still stands.
They genuinely feel much worse than they were before to a point where I’ve been looking for alternatives.
The matchup has completely flipped, by the way, and is, much like PvZ is currently, in Protoss’ favour, flipping completely in the other direction. It’s flipped from PvT being 47% to PvT being 52%. Both are quite within the 5% margin of error, though it is quite a drastic jump.
HTs have always been viable. You just have to put them in a prism and use them there to protect them from EMPs. Also don’t lose the prism, which is THE MOST common mistake from every protoss pro I see, to an astounding degree.