Sure, “a couple of days” after the snapshot is fine when updating on final QA but they should elaborate on this exactly when things are ready, then give a definitive time (preferably at least a few hours) for the main net launch so all the miners can start the race at the same time. I know suprnova usually switches from test to main automatically which is a solution for some but does not address the core issue.
Unless there is another valid reason for this such as avoiding chain splits or 51% attacks?
I agree exact date is needed - not fair and dangerous otherwise.
Fair normally for a fair fork (ie not premining or whatever) is to switch from testnet to mainnet, provide the full nodes addresses, a working explorer, a not scammy wallet, exchange, etc
The good reason for the delay is not a 51% attack, BTG had a 99.9 % "attack" from suprnova, and maybe the same will happen here, I think nobody cares, that's the interest of nobody to rewrite the chain in such a context
The good reason is maybe that they must merge the utxos of the two chains, but then they just should explain it, their white paper is a kind of technical overview for beginers mixed with some kind of Bitcoin history
One of the reason why I made the tool (https://bitcointalksearch.org/topic/m.31273044) is that you don't depend on anybody to move your coins (explorer, full node sync, wallet sync, etc), you can just do it by yourself as soon as mainnet is live using BTC and ZCL explorers