My request: Be consistent in your releases. It's the D Tuesday and I've yet to see updates for 2004, 1903/1909, 1809 got theirs last week. So is it going to get these preview updates or not? Then ALL of my systems are blocked at this time from getting 2004 so I'm not seeing this "optional offering". "Go to Settings > Update & Security > Windows Update. In the Optional updates available area, you’ll find the link to download and install the update." When 2004 isn't being offered to your systems, you don't see this optional delivery mechanism.
Next because .net updates and windows updates apparently use different update delivery platforms, .net previews are offered up totally differently than windows previews. Per https://support.microsoft.com/en-us/help/4562900/kb4562900-cumulative-update-for-net-framework "To download and install this update, go to Settings > Update & Security > Windows Update, and then select Check for updates"
It's the same platform, can we get consistency on how the updates are offered up? It's confusing.