I think that's a thing where there is a grain of truth but needs more explanation. It's not just that they die quickly if used daily. Tesla seems to design their charging products for "just barely" at their maximum rated amps. All of their charging equipment had some pretty bad failure rates when run at maximum amps daily. 1st gen UMC at 40A, the 1st and 2nd gen wall connectors running at 80A, and apparently the 2nd gen UMC running at 32A all get pretty hot and had some noticeable number of early life failures when run at max amps daily. And when done every single day that way, you get pretty significant swings of heat cycle of hot/cold/hot/cold, which is some materials stress on solder joints and electronics, etc.I used to only use the mobile connector in my garage until recently. I was talking to a Tesla Service tech and we started talking chargers. In his experience constant use of the mobile leads to a lifespan of about 2 years. The Wall Connector is more robust and designed for long term. This past weekend I wired in a wall connector to a 50A circuit and it’s been great. Now I just take the mobile on road trips.
So when people ask about, "Should I turn down my charging amps to protect the battery?" The answer is yes/no. The battery absolutely doesn't care, because the charging rate on home circuits is so low. But to maybe preserve the life of your charging equipment to make it last longer? Yeah, that probably isn't a bad idea. Turning it down just a bit from its maximum level makes it run cooler and usually adds significant time to its functional life. I have been running my old 1st generation UMC at about 31A instead of 40A to keep it cooler, and it's still going for over 7 years.