I'm a 20 year IT and DevOps guy, and I run Synology at home after years of old servers and whitebox home labs.
I use it because it Just Works, and when I'm at home I want to be working on my personal projects and relaxing, not learning or troubleshooting.
I have the full *arr suite, Plex and file services on my DS920+, and unless I'm transcoding several streams, the CPU barely gets warm.
I do plan on adding some edge devices on NUC, Mac Minis or Arduino, but they will run strictly as edge devices or specialty boxes like video conversion.
More devices means more complexity. The Synology is perfectly capable of running my house stuff for me, so I keep it simple.