With the launch of Stormblood

[Reynhart]

This became even more of an issue after the 3.2 tank nerfs, which was SE way of telling people: A tank should tank, nothing else.

No, it wasn't. It was a way of saying "tanks should not have to pay millions of gils for pentamelded accessories when other jobs don't".
The same weight for STR and VIT was made so that STR is never the best choice (Unless extreme bad itemization for secondary stats) and the 0.45 weight was made to ensure that tanks would never end with higher attack power than DPS, since VIT values increase faster than STR values on armor.