you are right...
I love to wear my watches and don‘t see them primarily as an investment object. But of course I don’t want to be cheated either.
I hope that the expertise of my AD (Bucherer, they have very competent, committed watchmakers there, as far as I can tell) is sufficient.
And sometimes I had asked the manufacturer for papers and serial numbers via my AD before accepting an offer on C24 - for example regarding my IWC MR, where I in addition travelled to Milano to meet the seller personally. But that's an effort that I can't or will not do every time.
All the best
Thomas