Won't somebody think of the landfill?
About 3 years ago I bought a Neato Botvac to do the housekeping I hate. It's a mid-range £350 model, just about smart enough to manage a 2-bedroom flat and the pre-vacuum floor clearing is a good way to tidy up.
After about 2 years it ground to a halt and the usual maintenance didn't help, so I got onto the support line and they lead me to a lot of stiffness in the brush rotation. Their solution was to replace this large lump of plastic. My solution: remove the spindle (an easy part of the regular maintenance routine), gently unclip the cap and - hey presto! - remove the lump of dust clogging it up. A spritz of WD40 and it worked like new. Now it's part of my regular maintenance and has been running smoothly for another year.
I wasn't really bothered about the £25 cost of a new brush, but the thought of chucking the whole thing in landfill when it was so easy to repair. Consumer tech companies have to move beyond this mindset if we're going to escape the disposable society that has us drowning in mountains of plastic waste. At the very least, make it possible to return the parts and buy refurbished units instead of churning out disposable crap.