The problem with many home screen and statusbar applets is that they gradually consume more and more memory over time. Since they run all the time, this leads to slow application response times and eventually to a tablet reboot.
If they don't stay idle when the tablet is unused, battery also gets drained very quickly because power management cannot come into action.
If you're having memory or battery issues when running applets it's a good idea to reboot the tablet from time to time until the issues are fixed in the particular programs.