Exactly. The little home brew systems don’t have the sophisticated DSP tuning and driver compensation of the HomePod. It is a technological tour de force in a tiny package that can fit anywhere, with great WAF.
Being omnidirectional, it is perfect, for example, between kitchen and dining room, serving both rooms equally well, with no mess of wires. It’s an appliance, meant to do one thing, and do it well.
No, it won’t replace the “main rig”, but 90% of the target audience for these don’t have one. They have sound bars and earphones, maybe a crappy little Bluetooth speaker. This will get them listening to music again, out loud, with very good reproduction quality.