If Teslas had nearly any concerningly significant number of drivetrain failures, nobody would buy them and they've been around long enough for people to catch up. I did plenty of research before buying mine and I follow Tesla quite closely. Haven't heard any concerns in this regard.
I expect Tesla to only get better for the time being.
Please tell that to someone dealing with back to back DU replacements within a couple of years owning their cars.
Or people being told to scrap their cars by Tesla service advisors because even if they fix their DU something else will just break: https://teslamotorsclub.com/tmc/threads/out-of-warranty-driv...
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All cars have reliability issues.
We need to stop pretending like replacing one powerplant with another will change that. An entire generation of drive units are failing because of an issue the same boring issue that kills so many ICEs: Coolant getting where it's not supposed to because of a failed seal, causing lubricants to fail.
If you want a car that will go a million miles today, a "boring" base model Lexus is probably a safer bet than a Model 3.