Earlier quoted context omitted.
The parent did not say that plugins caused bloat, instead that resolving common problems with plugins (stability, quality, conflicts etc.) by pulling them into core is what causes bloat (slowness, complexity etc.) and that trying to resolve the tension between flaky plug-in based systems and bloated monolithic systems is cyclical.
Still: is anyone complaining of Emacs or Vim or ST3 being slow/complex because they have installed plugins to the core? What's an example in the wild of this "cycle of bloat" in which people complain about it?
Atom exists because ST3 was seen to stagnate, ST3 exists because TextMate was seen to stagnate etc. They start as simple but incomplete tools that are moving fast and blah blah - its just the software circle of life.