The inertia of entrenched ideas, that's what. The only people interested in improving reserve, are those stuck with it and those who bid it intentionally. The current MEC seems to have an inkling that some tweaks are necessary, but I'm not holding my breath.
Some pilots are habitually myopic and ignore even very recent history. UA lurched backward several times since I've been here, displacing thousands of pilots, yet "reserve is a choice" is still their mantra. Your topic has been beaten to death on this and the other forum. Yet, reserve is still second-class citizenship around here.
Keep an eye on the hornet's nest you just posted and you'll get your answer.