@der-kuenstler For some reason I’m just finding this thread now. I mostly agree with what others have said. The only thing I want to add is that if you want to play with more than the simplest of house rules, you should feel good about creating play aids to support those rules. Seriously, go out and print your new rules, in full color. Put some thought into how to design and lay out a chart or a cheat sheet that will help players remember and use your rules. Cut them out so they’re the right size, and then laminate them or print them on heavyweight cardstock. If your rules involve any special pieces, buy sculpts for those pieces or use some paint or something to convincingly alter the closest available piece; don’t just slap a chip underneath artillery and say “OK, now it’s a self-propelled artillery.”
If you’re not willing to put in that work to make things easier on your players, then why should they put in the work to test out your house rules? It can take 8+ hours for a single playtest; if you invite 3 friends over, that’s 24 hours of other people’s time. You should be willing to put in at least 10% of that (2 hours) on creating play aids to improve that experience. If you’re not, maybe that’s a sign that you’re having so much fun imagining new rules that tickle your fancy that you’re not really thinking hard about whether those rules will be fun to play with for others.