Having GUI wallet for windows or not, at the current period, does not matter.
It matters a lot. Where can Average Joe hold Grin? On exchange only. And we all know how bad decision is that. It's in first 3 advices you give someone ("don't keep your coins on exchange")
BTW, even terrible projects, some obvious scams and money-grabs have Windows GUI wallet.
So, the fact that Grin doesn't have it is intentionally for sure. Why? I'm not sure.
Yes totally agree with you.
It's not the best idea to keep the coins in exchanges. Not save enough.
And for more investors that newly discover Grin, the first thing they would like to do is to download a wallet.
But I've no idea how hard it takes to develop a GUI wallet, maybe someone could support them together.