I'm also a Miele canister vacuum owner, and everywhere in my house where I vacuum is within range of a wall outlet. When I'm done, the cord retracts into the vacuum so I don't need to wind it or stow it myself. I guess, for me, that takes care of the issue to a great enough extent that I just never saw an advantage that justified the expense?

Cordless is nice until the batteries won't charge anymore. Or the charger stops working. Or you forgot to charge it and now want to use it. Or the charging connector gets worn and unreliable. Then you have an expensive battery replacement or other repair or (more likely) you just replace the whole device because it was made to be unrepairable, and now you have several pounds of plastic and e-waste to dispose of.

Dealing with plugging a cord into an outlet is no more burdensome than picking up the socks or shoes before the Roomba wakes up and tries to ingest them.