When the battery in my '16 R went tits-up, it did so right at 24 months, and totally without warning. It was cranking fine and showing no signs of distress - then dead as a fart the next day. I forget who the mfr was but it wasn't a Varta, which my '19 R has, and is 3 years old at this point. VW has a bad habit of using some very sketchy battery OEMs. Varta isn't one of them - always quality stuff.
Part of the problem we're dealing with is a very hot engine compartment, which shortens battery life. When replacing just get the longest full-replacement warranty you can find, preferably in AGM. If you upsize the battery, get the bigger insulation blanket for it - the p/n is buried here in an older thread someplace.