Curious if anyone is still using the original hub by itself and how many devices you have attached.
by original, you mean the C3 Hubitat hub?
Of course I am. Device page shows 80 devices
I also have a C5 hub running my Lightify lights.
C-3 has 99 devices.
C-4 has 69 devices.
C-4 has 167 devices.. which is combined from the two, because this is my HubConnect Server.
I have three HE hubs, but only two are "production" as many here call it. The third is for beta testing. Could have easily kept everything on the first hub, but I made a personal choice to use old Aeon v1 HEMs and to refresh them very frequently for my use cases. This caused instability on my primary hub. So it's not that I had to because a single hub is inadequate. All my "Stable" devices are on the main hub (sort of). It's a bit hard to just say I've got nothing but stable devices on the main hub, because almost all my lighting is now on a Hue bridge and I use the integration. So while Hue are not unstable devices by nature, they will destabilize my Zigbee mesh if I attached them directly to the main hub.
It's also fair to point out that I use a few Xiaomi devices on the main hub, but most are linked via Homebridge through an Aqara HomeKit hub. I also have some lighting dimmers, switches and micro modules on Insteon and link it via the community Integration, so there's yet another hub.
So , I guess the short answers for me is, I've never had everything all on one hub!
[Edit] And if you're asking about OG hub as if it makes a difference in C3 vs C4, it doesn't. I swapped them and the one with problem devices (the Aeon v1 HEMs) still needs daily rebooting.
I've got a C-3 (Hubitat hub #26, back when they hand-wrote it on the bottom ) running great! I have almost 200 total devices, but the only "real" devices on this one are around 50 Z-Wave devices. The rest are mostly LAN devices, either running natively on this hub or brought in via HubConnect (I have a C-5 with all of my Zigbee devices on it that I dedicate entirely otherwise to lighting automations, plus a couple other hubs for development and testing).
Love my C-3 but have to admit I was all excited when my C-5 came in and it had the HE logo on it!
C3 #23 still chugging along. 76 real Z devices (25 Z-Wave, rest Zigbee) and a couple of LAN devices.
Hub #13 checking in. 81 z-wave/zigbee devices (including 28 Xiaomi sensors), 6 LAN direct connects, plus a half-full Hue Bridge.