The vacuum cleaner I had, floor model, corded, would have been 10-12 years now. I fixed it and proptly sold it. I don’t think it would withstand another teardown without breaking something. I’m not saying the engineering concepts are bad, but they are designed with planned obsolescence, with fragility in mind.

Filter Queen was making home cyclonic vacuum cleaners from 1928. No innovation there.

Bagless vacuums have been around a lot longer too. Bagless vacuums are more convenient at first, but filters will eventually get impossible to clean completely. I have a Bosch 2 in 1 cordless, hand/broom, which I hate cleaning out. With my Kobold I simply replace a paper bag. Clean and fast, and the bags are quite cheap.

The things I’m referring to are not sacrificial parts, like the gears you mention, but parts and shells that don’t need sacrificial parts, quite the opposite.

All in all, there is absolutely no reason for those vacuums to cost 5x the price of equivalent competitors. Does a conical brush justify a 600€ price tag?