I'm a connected device enthusiast, as a result of the connected device work I do at work. I find the market highly fragmented, the ecosystems are mostly walled gardens in the making and it leads to a broken customer experience.
Currently, I own a BLE toothbrush, locks / key pad access, cameras (outdoor and indoor), Echo, Garage Door opener, sprinkler system, thermostat and doorbell. It's a lot to manage. I find that I'm deeply engrained in the OEM app for the first couple weeks, to understand / tune configuration. But, after that, use is ad hoc or managed via alert driven interactions.
What do you own and how do you manage it all?
I've ended up leveraging almost entirely RPI's/arduinos for just about everything, with some amount of homebrew fire-waiting-to-happen mess of soldering on top.
this lets me manage all the pis with a single ansible deployment. I have my own on-prem "discount IFTTT" as well, but if lacking that, some service to that sort would also be critical for message based orchestration.
(functionaly wise; I have the pis managing garage door, plant growing automation, cameras, media devices; halfway through getting some lights set up on one as well.)