Well, playing beta version always have some risks, so there must be no reason to complain. There must be a backwards compatibility between versions (saves from
1.50.0.10 must work fine with
1.50.1.0), the tricks may be in some details changed in one beta sub-version and returned in another, like adding the new tuning options may reset them on the trucks you already own. So it’s still better to wait a retail version release — I usually switch to beta only for making the side-by-side map or truck comparison screenshots, and after that return to the actual release version (the
latest autosave may be lost in this case, so I copy
all saves from the backup folder and paste them back after returning).
As for the bugs... I don’t remember the really serious ones. The parts of the map which remain grey after you drive there, or the invisible walls in the middle of the bridge — this stuff is usually fixed in the first day after the developers collect enough feedback. Something bigger, like an invisible pit near
Chemso depot in Portland or
a situation with crashes I have experienced, the feedback about them can appear a little later, but they still are fixed the next day after report. Of course, there is a category of players which really suffer from the bugs — the pirate version users

. The pirate makes a repack from a first release version, and... updates it only after the next release in three or four months

. I remember the similar situation with
Shantae and Seven Sirens — the forum had
a lot of complains about the long loading screens... which were posted
long after this was fixed in the actual
Steam version

. Also, the update of the pirate version means you need to delete the game (making a backup of the save folder) and install the updated repack again, so, just imagine there are someone who have installed and deleted their
ETS2 folder 49 times since 2012.