FWIW, if you don't update every ios device, you'll get errors in the Home app. I had an old iPhone in the drawer and not used. I was getting "non responsive" messages on the iPad and apple watch apps, while my primary phone was working ok. After I updated the old iPhone, things magically started working again on all 4 devices.
Just for a clarification. If you don't have a Homehub or Mini or Ipad, as long as you don't enable the architecture will the phone app still work ok? I realize there won't be any remote access, but will it still work locally?
If you don’t currently have a Home hub, the update shouldn’t have any negative effects as long as your iPhone(s) are all on 16.2. I think the only issue would be if you were using an iPad as a Home hub, or had older devices that cannot be updated to the current release.
Unfortunately I’ve got the same issue at the moment. Let me know if there are any work arounds while you are working on the fix. Otherwise I’ll just keep an eye out for a software update notice.
Assuming you mean “device(s) is unresponsive”, have you enabled “relaxed Home hub pairing security”? Otherwise, what I’ve gathered from this and other similar threads, deleting the HE hub from Apple Home, creating a new qr code in the Homekit beta app, and adding the HE integration back to Apple Home seems to have fixed the problem for those that have tried it. If you try the latter, I left all of my devices selected in the Homekit beta and then was able to add them all back to their respective rooms during the pairing process, which was far less painful than doing it after the fact.
I did the whole new QR code and Hubitat is still broken. I have 10+ bridges with Homebridge and not a single one had any issues. Hubitat is the only one with chronic and systemic issues with my setup.
Yes, the non-responsive issue. I did enable relaxed home hub pairing, it worked at first, but within several hours they went no response again.
I just updated my hub to a new version that appears to have been released today... after the reboot the devices came back. We'll see if they stay that way.
Oh! I checked this morning and no update, but now it's showing. Just updated. Will monitor.
That update was released yesterday.
@ogiewon found that Apple pulled the new architecture upgrade:
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Saw that... wondering what they are going to do for those who already upgraded. 
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I had already upgraded. Spent a couple hours getting everything to work again. It’s been steady for several days. So hoping it will stay until Apple fixes it again.
New Home Architecture was flawless for me, except for the Hubitat hub. All my Homebridge child bridges, of which I have many, didn't even hiccup. But there were a flood of complaints on all the Homekit forums I browse, so it's no wonder Apple pulled it.
At the risk of jinxing everything, I upgraded to the new Home architecture and I've been stable from the Hubitat integration perspective for the last several days.
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Mine has been solid since the addition of the relaxed homekit pairing. It has never shown devices as unresponsive since this was enabled.
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I upgraded to the new Home architecture. Mine was solid before, but after I had problems with everything becoming unresponsive. I ended up having to start over with the nuclear option. Since then — a couple of days — it's been fine.
Which nuclear option? The Apple that nukes all iCloud Homekit data, or the Hubitat one of changing the QR code on the bridge and re-adding?
The Hubitat one... new QR code and re-adding.
@gopher.ny So far with the latest Hubitat update everything seems stable, without any LUX sensors. No no response issues for 2 days, which is a record.