I understand completely. Just to be clear though, sync does not have to take hours/days. ZWallet can sync the entire blockchain for zecpages in less than a minute.
I feel there is a certain level of expectation coming from a listing on the z.cash website though. When someone contacted Naomi Brockwell about why she didn’t mention ZWallet, she replied that she would only consider it after it gets an audit from a third party. It implies she believes the z.cash wallets went through such audits.