"Player outcry" was my weakest of the arguments. Your examples come from long ago.There were a few alterations in the past. Both the T7 and the T9 got a cargo capacity buff. The FdL got it's power plant upgraded from size 5 to size 6. That last one caused some controversy, concerns that the FdL had become too good. And initially it was, mainly because FDEV forgot to adjust the heat profile of the ship. In the months until that was adjusted, the FdL could spool up it's FSD while sitting in a star's corona, scooping at maximum rate and not overheat. Unless FDEV plan to phase out all the old ships by making new ones for every role that are better, I could see some changes happening again.
The financial reasons weigh in much more.