Peart retired after the R40 tour (which I recall he only did on sufferance), several years before he became unwell. Clockwork Angels was their final album and as far as anyone - band or fans - were concerned it was over. And that was a shame but their choice - so fine. Lee & Lifeson said they'd maybe work together again at some point but it wouldn't be 'Rush'. The assumption was it'd be new music in some form.
The Taylor Hawkins reunion thing was quite unexpected, and I do remember reading that afterwards they said the phone "hadn't stopped ringing". They were highly dismissive of the idea of going out as Rush with a different drummer.
Lifeson went off to do his Envy Of None thing, and Lee's written three books - it sort of looked like they'd found new outlets. Personally, as I said, I hoped they might get the bug to make some new music together, but instead they've done the very thing they seemed pretty adamant they weren't going to do.
For musicians who I always admired for making their own decisions & not succumbing to commercial pressure, or doing anything the easy way, this feels pretty sad.