used Amazfit Bip cost also nothing and will still last you 3 weeks with always on display and Bluetooth enabled, Pebbles are overrated

Same. The Bip has a 30 day battery life. There's no SDK though so it's not as tinker friendly but when used with Gadgetbridge I get the privacy and some neat features on top. Plus there's a pretty big online community around hacking it.

No 3rd party apps for the watch of any kind, it has no ecosystem. I had one, and yes the battery time was good, but everything else about it was sub-par.

And how useful is that on Pebble sized screen? I can read all notifications on Bip (that's reason I bought it for), answer/reject calls, track all my vital signs, use it as navigation, use it as flashlight in night (that's second most used feature besides checking the time/date) and with little hacking I could use it as remote control for music player.

Please list useful apps I am missing and which are usable on small watch screen, because anything requiring typing is certainly not useful and it's horrible experience and I never use some predefined quick replies.

Obviously Bip with open system would be ideal, but if I have to choose between expensive abandoned old thick Pebble with crappy battery life but abandoned dead ecosystem of apps and cheap ultrathin light Bip with amazing battery life in weeks with all basic features one can require, it's easy choice and reason why nobody knows Pebble besides few nerds, why the company failed, but Bip is much more known about ordinary people and its brand still going strong (sadly with transreflective displays and amazing battery life abandoned).

One app I used quite often on the Pebble is a TOTP app, where I could retrieve my code from anywhere, even if I forgot my phone that day. Since the battery life was awesome, it was comforting knowing I wouldn't get locked out of my stuff easily.

I also used an app to see a camera preview from my phone and as a remote shutter, I also relied on NavMe to see the Google Maps direction while walking or while riding a bike.

Another app I was using was to send HTTP requests to toggle some of my IoT stuff, that was quite handy too.

IIRC the quick replies could be entirely customized, and I found myself using them quite often.

fair enough, TOTP ain't possible on Bip, though camera shutter and navigation are both available

but those things you described as not available are extreme niche, so Bip would be still winner for most of the people

Overrated? By who? The amazfit came out like 2 years ago, Pebble launched with 7 day battery in 2012...

overrated since 2018 release of Amazfit Bip, yes, it has more features than Bip but they are hardly usable on such small screen anyway