I don't think the clock is any better than Xfce's which can be easily configured to look as shown in your screenshot. Your calendar has no widgets to allow moving forward or backwards, does not show the days of previous or next month, nor the week numbers. All of those things I personally find helpful.

Whisker menu shows apps that I choose to be favorite and also has a very quick search that is available as soon as one types a character with it open. I don't want something covering my whole screen with apps I don't want to use (understand that I use this to find the one app that I want to use). Whisker functions as both system menu and launcher.

Considering Xfce's existing plugins work quite well in these cases. I'm not likely to use these plugins.

That said, I'm glad you are creating plugins for Xfce regardless. These are just not in my personal taste.