Earlier quoted context omitted.
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
How hard do you brush if you can _mechanically_ break an electric toothbrush?
Not sure I get your point, they're more fragile than manual toothbrushes not less. The metal connector part starts getting loose and it becomes loud and ineffective