"they" will always know how much I have stacked, since I started before I had fully educated myself on KYC vs no-KYC

the main USP to coinjoining is to maximize UTXO spending-privacy, whether it's for KYC or no-KYC sats

coinjoining is a best-practice for both

but there's nothing preventing someone from selling no-KYC sats back to fiat (other than the overwhelming shame and bitter taste in your mouth from doing so)