I find Philips Sonicare toothbrushes break after about a year, long before the battery gives up. Which i guess is another reason not having integrated batteries would be nice. But then they might not make as much money whenever I buy a new one so they probably wouldn't do that
I've never experienced them breaking that quickly, but it's worth pointing out that the cheap models are far inferior. The motors are weaker and they even come with a worse charger that doesn't come with a normal wall outlet plug.
I don't like USB-C for toothbrushes to charge because there's water in the bathroom. The proprietary inductive charger/stand that comes with Sonicare/Oral-B electric toothbrushes are ideal.
Sucks that they are proprietary but they have been trivially easy to clone by third party manufacturers. $7 on Amazon.