Today, Shopify forced my site to SSL "https" - which I knew was coming.
So, I've added the new https properties to Google Search Console.
Shopify advises to "remove your domain's HTTP sitemap from its profile".
However, threads here and elsewhere say not to remove the old http properties - or at least leave them for 30 days.
So now I have four properties (the two old "http" versions (www and non www), plus the new https versions (www and non www) - with the prefered domain set to https://...
Google says this is legit.
Why is Shopify telling us to delete the old http properties?
What do you advanced techical SEO peeps say?