Everest has been the biggest example, so far. The belief for a while was "Well, it's the park's marquee attraction. They need to open more stuff before closing". It's been 6 years since Pandora so I don't think that was the case. lol
Other examples... GMR - they wouldn't have the cowboy scene during slower seasons. Space Mt would only load one side. Never finished the SSE finale. Old Test Track had lots of issues that weren't fixed until they Tronified it. Way back when - The Living Seas cut the cabs before it eventually came back as Nemo. Those are off the top of my head - I'd really have to sit and think.
I believe RNRC's problems now are due to a cheap refurb instead of a proper refurb.
EDIT: Stitch's Great Escape was just shuttered because of poor GSATs. Been closed since 2018.