> Personally, I have a Roomba I bought in Jan 2019 that's still doing just fine (So 7 years now).

BTW I just found on a bunch of robotic vacuum websites that 4-6 years is the quoted expected lifespan with maintenance:

https://us.narwal.com/blogs/product/how-long-robot-vacuums-l...

https://ca.dreametech.com/blogs/blog/how-long-do-robot-vacuu...

https://au.roborock.com/blogs/roborock-au/how-long-do-robot-...

I think that likely means without maintenance it is a little less.