Depends on what you mean by “back in the day”. So far as I know you could be ~30, and “back in the day” for you is the 2005 era.
For some of us “back in the day” is more like the early 90’s (and even earlier than that if we want to include other online services, like BBS’s) — and the difference since Eternal September is pretty stark (in both good and bad ways).
There are a lot of manufacturer-agnostic smart home devices out there, and with just a tiny bit of research online it’s not difficult to avoid anything that is overly tied to a cloud service. Z-wave, ZigBee, Thread/Matter devices are all locally controlled and don’t require a specific companies app or environment — it’s only really the cheapest, bottom-of-the-barrel WiFi based devices that rely on cloud services that you have to be careful of. As with anything, you get what you pay for.
Even if the Internet were destroyed tomorrow, my smart door locks would continue to function — not only are they Z-wave based (so local control using a documented protocol which has Open Source drivers available), but they work even if not “connected”. I can even add new door codes via the touchscreen interface if I wanted to.
The garage door scenario can be a bit more tricky, as there aren’t a lot of good “open” options out there. However, AFAIK all of them continue to work as a traditional garage door opener if the online service becomes unavailable. I have a smart Liftmaster garage door opener (which came with the house when we bought it), and while it’s manufacturer has done some shenanigans in regards to their API to force everyone to use their app (which doesn’t integrate with anything), it still works as a traditional non-smart garage door opener. The button in the garage still works, as does the remote on the outside of the garage, the remotes it came with, and the Homelink integration in both of our vehicles.
With my IONIQ 5, the online features while nice are mostly just a bonus. The car still drives without them, the climate control still works without being online — most of what I lose are “nice-to-have” features like remote door lock/unlock, live weather forecasts, calendar integration, and remote climate control. But it isn’t as if the car stops being drivable if the online service goes down. And besides which, so long as CarPlay and Android Auto are supported, I can always rely on them instead for many of the same functions.
Some cars have much more integration than mine — and the loss of those services may be more annoying.
The Fediverse is a bit more like the old USENET days in some regards, but ultimately if it ever becomes more popular the same assholes that ruin other online experiences will also wind up here.
What made the Internet more exciting 30 years ago was that it was mostly comprised of the well educated and dedicated hobbyists, who had it in their best interest to generally keep things decent. We didn’t have the uber-lock-in of a handful of massive companies running everything.
It’s all Eternal September. There’s no going back at this point — any new medium that becomes popular will attract the same forces making the current Internet worse.