Understanding how component audio works and not relying on all-in-one solutions is, IMO, well worth the time and effort. As others have said, a carefully considered stereo or multichannel audio setup will completely destroy a HomePod for audio quality and flexibility. But building that system, like doing anything the "right" way, takes time, research, and likely a greater investment than $600, and only you can decide what is most important—absolute quality, or your time spent achieving it?
If you're really committed to buy, plug-in, and run away, Sonos is your best bet. Are there ways in which the HomePod is better than most Sonos gear? Yes. But in terms of ease of setup and use, there's not much else on the market that's plug-and-play but with a focus on audio quality. And Sonos has a good range of options that allow you to tailor your setup without a ton of fuss.