This really illustrates the concept of "code rot"... as OS software and machine hardware advance (and they're both doing that quickly) programs seem to 'slow down' and cause more and more problems.
The solution up until now has been to have more and more coders working at keeping programs 'current' and as functional as the OS allows. Small companies find that very hard to do as they have to remain profitable in order to just that.
Now, MIT and Adobe (think - Photoshop the industry gold standard legacy program) are working together to create a new concept..."Helium" which is "self healing/self optimizing" software...nice for the future, but this is here and now.
Back to the real world: Stardock created many apps to address the demand for customization. That demand has fallen off, while paradoxically W10 is far uglier than the usual OS, and to make it more secure, more portions are "hard coded" and not 'accessible' to modification. To find 'work arounds' and 'fix' the software to work with the new OS and new chip architectures, takes time. Had IP been 'fixed' for W7, it wouldn't carry over to W10 (which will continue to be W10, but be periodically updated and 'evolve').
So, to 'fix everything' at this point would require man hours which have to be covered/paid somehow...the gaming side of SD...which also requires manpower/devs/artists/QA, and coordination of all this determines priorities...because customization is declining, the site and software priorities are coming secondary to the gaming side, which more and more supports us.
This is the reality. None of us loves this reality, but there it is. Forbearance and patience are a plus, because really, nothing else will help.