I used a hub too, but that was my plan as I also have a Zigbee stick, so the spacing was much better.
Moving the Z-Wave stick away from your Pi is a good thing. Less radio interference. And you can place the stick in a location that your Pi might not fit (especially if you use an extension cable.)
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I have the aeotec stick but I’ve recently bought a pi 4 (4GB) and I also have an everspring z wave stick.
I’ll be trialing an installation with that configuration soon so I’ll report back.
Deconz Conbee2
Okay, I built a second HA on a Rasberry Pi 4 (4GB though that shouldn’t matter)
I inserted the everspring z wave stick into a USB 2.0 port
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Transfered my yaml files across, rebooted and …
Sucess, you don’t need a USB hub with this stick on a Pi 4 
I only have 1 node connected at the moment but I’m transfering my whole setup next week (I will report back any issues)
The stick reports z wave plus: false, but then so does the aeotec stick.
I have connected a z wave plus device and that is reported correctly and performs as such (reporting of manually switched status)
did you add now all your devices without any problem?
I use the nortek dual zwave/zigbee usb stick on my rpi 4 with no issues.
Without a usb hub also?
Correct. Plugged directly into the rpi 4 USB port.
I mainly use the zigbee side, but the couple of zwave devices I added seem to work as expected, too.
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I was having issues with the nortek stick. Zwave would not pair correctly to locks with secure node and zigbee would have heartbeat timeouts. Ended up using a unpowered USB 3.0 hub and all that went away with my rpi4
Good to know. I don’t have any securely paired devices in my hub, so wouldn’t have seen that.
Thanks.
So if I have a aeotec stick with my RP4 - I need to use a unpowered (or powered) USB 2.0 switch?
I have tried to connect the stick directly to my RP4, but I cannot find it, when doing the lsusb in terminal, it doesnt show the stick?
poudness, you didn’t reply to me so I got no notification.
I am now assuming you were asking me ? if not please ignore this.
Yes, I have been using the Everspring stick (with Pi4) since my post with multiple pairings and “No Issues !”
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I used an unpowered USB2 hub, I think it’s an issue with USB3 port electrical specs, so as long as it’s USB 2, I bet you’d be fine (but powered is certainly not needed).
Yeah I know Merlin firmware for asus routers has an option to downgrade usb3 ports to us b2 to reduce wifi interference. So I think usb must have faster switching that gets into microwave territory, rather than it being a hardware thing.
No, it a documented fault with the Aeotec stick that it does not follow the USB 3 power specifications.
(there are links on the forum or just google it)
You could also say it’s the RPi Foundation ‘for following the specs’ but that would be silly
Makes sense, since it is zwave and that asus thing had to do with 2.4 issues with usb3. That said, it could be relevant talking about zigbee hubs.
So I bought a USB 2.0 hub, and it worked 
Now for next question: after setting it up, and if I try to to say lock, I get following error in the OZW_Log.txt
Error, Node003, ERROR: Dropping command, expected response not received after 1 attempt(s)
Sorry, what are you saying this to ?