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p8 got 5 variants and i bought the troublesome one, bad experience.
you would buy 'troublesome one' if you'd get one based on Goodix GR5515 CPU as some other people got, as long as it is nrf52832 they are just different :-)
i'll better pay more and buy the version that is used by most people
Oh, if you know which one it is (I don't) then how will you find shop that still sells it? It may be quite random what you get, most sellers even don't know (or care) what version they are shipping. That may be one advantage of Pinetime - it is basically a P8 but you pay extra to get same version as others.
not true, can be programmed over BLE too and you can of course take it apart if you prefer SWD
I'd say it is almost trivial but I may be wrong :-) For starting and learning the version is not important. By the time you learn enough (even with older version) you won't be asking that question. I did not update my builds mainly because nobody had issues with older version and it is probably the same reason for other builds you found. So feel free to jump in. Building your own build from source for any device is a good start.
And BTW Pinetime or P8 is 52832 based watch like Bangle 1. Bangle 2 is 52840 based so it has 4x the RAM (256 vs 64 KB) and 4x faster SPI for updating the display. There are also very cheap hackable 52840 watches like C17/Magic3 or QY03
https://www.aliexpress.com/item/1005005373233740.html
https://www.aliexpress.com/item/1005002688104850.html
However I am not saying that P8 is not good enough, it is perfectly fine too.