I think VIT has it's place, even if it's not the most effective stat.

When I was leveling my tank jobs I went full vit, it's a good cushion and gives you more room for error per say.

Once I had hit lvl50 and had gotten comfortable with content and my job I started mixing and matching str and vit.

After that I went full on str, but keept vit around in case it's needed for some reason or another.

As for heavensward content I usually rotate str and vit well leveling than go back to full str once capped, though I do have 1 vit ring and allocated my 35 points into str, mostly because the vit ring had better secondary stats than the str, plz SE I don't need all this acc ...