I currently have a ATV 4K in the living room and 2 Nanoleaf Essential bulbs (mainly as an initial Thread test), one behind my TV and one in the bedroom. I’ve been running them for around 6 months now and it’s been great and instant response time, aka as soon as I release the Siri button on the remote the light turns on, we’re talking less than half a second (weirdly enough on the Mac Mini Siri takes a couple seconds to communicate with them, I don’t know why). I’ve stumbled upon a weird bug fairly often where the lights show “updating“ for a couple of seconds in the Home app/control center and idk if it’s a Nanoleaf or HomeKit bug.
Going to add 2/3 Nanoleaf lightstrips next month for my desk, TV and bed, and I’m looking into getting several Eve plugs to monitor energy consumption on certain devices, and a HomePod mini. I don’t have a lot but I’ve ben happy with the experience.
For the Thread router, it depends to be honest. I use my ATV daily and I don’t take it during travel so it’s always there to handle everything. HomePod Mini is cheaper, but if you have no use for it and you use your ATV, might as well upgrade.