Yes, I agree. Ideally npub.cash is used through a wallet, which handles this. The website is more of a demo However there is a pop-up telling you about all of this when withdrawing :>
Oh yeah, nostr:nprofile1qqsph3c2q9yt8uckmgelu0yf7glruudvfluesqn7cuftjpwdynm2gygprpmhxue69uhkv6tvw3jhytnwdaehgu3wwa5kuef0qyt8wumn8ghj7am0wshxummnw3ezuurpwf68jtcpzdmhxue69uhhwmm59e6hg7r09ehkuef0gn5qes have you tried npub.cash via cashu.me ? You can withdraw into it directly (same for the cashu wallet in iris)