Are there more tanks playing now?

[Deceptus]

That's not an answer.
For example, let's say you tank A1S, what do you really do differently when you wear STR instead of VIT ?

That is absolutely the right answer. A tank with lower hit points has to use their CD's much more effectively and smarter than a tank that has a higher hp total. Both specs using the proper CD, Taking the hit that puts you at 1k hp and dying to the next auto attack is worse than having a 5K buffer after the big hit. A STR tank might have to pop an extra CD is Conva or Thrill of Battle that they might need to save for the next tank buster.

[Reynhart]

That is absolutely the right answer. A tank with lower hit points has to use their CD's much more effectively and smarter than a tank that has a higher hp total. Both specs using the proper CD, Taking the hit that puts you at 1k hp and dying to the next auto attack is worse than having a 5K buffer after the big hit.

Still no. Having more HP doesn't mean you can afford to take a hit without proper mitigation. It's not because I have more HP that I won't use Rampart some time before Hypercompressed Plasma to keep my HP higher before and mitigate the following attacks too.
What is true, is that a VIT tank have more rooms for errors, but it's still errors.

A STR tank might have to pop an extra CD is Conva or Thrill of Battle that they might need to save for the next tank buster.

So, you have a real example where the rotation is different depending on what you wear ?