(...) Seriously, very small number of people use Dashboard. No one makes widgets for Dashboard anymore. It's a good decision to remove it.
Dashboard widgets can be made by anyone with knowledge in HTML and Javascript, making a notification center widget needs other knowledge and the App Store only has a bunch of widgets compared to the dashboard widgets, that are in the hundreds.
Also, try to have more widgets in the notification center, a scroll is guaranteed.
I can access dashboard without any click, amnd the real estate is much bigger, I have two screens, and I have several widgets.
I also have made several widgets to fit my needs.
Notification center is not a good alternative, I really don't undestand why they would kill dashboard, I knew it would disappear one day, they've been hidding dashboard more and more, so it was a matter of time.
I really don't like what Apple is doing, dashboard is just a small drop in this ocean; a lot is degrading compared to what was some years ago, Mojave is full of bugs (I need to restart some times so that the "application X is not open" error disappears (not to mention other stupid bugs)).
I love the Mac and MacOS, I've been using Macs since 1989 and will hopefully continue to use, but why should we make so many "detours" in our methods just to acommodate the way Apple would like you to follow?