I too jumped for a Jolla after Nokia's departure, with a 3D printed keyboard, thinking the experience of having this hackable Linux phone with on-device app development would be just as good as it was on the N900
Nothing has come close since. The perfect tactile feedback of the keyboard is hard to describe, the python apps you could mod and debug on a roadtrip, submitting patches on the fly to the upstream author.
The FM transmitter to play your music anywhere there wasn't an aux, the infrared to change your TV channel whilst relaxing on the couch, the kickstand and camera cover for the perfect convenience and privacy.
And the Maemo community was excellent, with many talented devs bringing their efforts to other ARM devices, and spawning orgs like Meego and Postmarket.
I can't put into words the budding hope and excitement there was at the time, but it just petered out once it became clear that camera specs and CPUs were all consumers cared about...