Why would you buy an expensive raspi for these scenarios?
Wasn't it meant to be a computer learning platform for people with no access to powerful computers?
Your applications don't need GPIO pins, so you could just use any small PC.
I know, right? I had to mortgage my family's ancestral home for the $35 to buy a raspberry pi 4 at microcenter. Luckily they had SD cards on sale, so I was able to buy the power supply and storage for the cost of a kidney. And now I can manage my home automation devices!
They are so widely used and well documented that for typical uses, they are no more complicated to do than an x86, in my experience.