I don't really trust Google to not break Nest integrations.
I wasn't following it then, but Google phased out earlier "works with nest".
Last year, the oauth for HA's nest addon broke. Supposedly they did work with Google folks to ensure a smooth transition. It works now.
But ultimately we use Nest with HA at Google's discretion. Part of the strength of HA is its ability to use cloud-free, local-only infrastructure, meaning it won't break on the whim of a megacorp.
FWIW, a lot of other startups have gone belly up, and taken their infrastructure offline, and that is worse IMO. E.g. I purchased my light switches from Lutron just because I knew they were going to be around (I have seen a few startups go offline). Before you say, "Oh, if they made it all local then stuff will still work". Yes, that's true to some extent, but then it is still possible that there could be security issues that need to be patched down the line. And one can say "Then you should quarantine the hub and have it connect to HA instance only"... but most people are not going to be able to do that, or may be too much work to maintain over time.
Hopefully with Matter, we'll see more products that can work securely + locally. But IMHO, the tech just wasn't there before (at a price point that was cheap).
Sadly, ZigBee is a failure in practice. If you buy a Zigbee hub from one vendor, it is unlikely it will reliably work with Zigbee products from another vendor.
Zwave doesn't have this issue, but it lacks market adoption. Likely due to cost, but I am not sure.
I've found zwave to be more flakey than lutron caseta. The "700 series" controller needed to have a lot of firmware patches in the time I've owned one. Even after that, I see a lot of dropped packets.
I wasn't following it then, but Google phased out earlier "works with nest".
Last year, the oauth for HA's nest addon broke. Supposedly they did work with Google folks to ensure a smooth transition. It works now.
But ultimately we use Nest with HA at Google's discretion. Part of the strength of HA is its ability to use cloud-free, local-only infrastructure, meaning it won't break on the whim of a megacorp.