I agree with a lot of the sentiments expressed here.
When I bought Homey Pro I was drawn in by the “Pro” moniker and that it allegedly supported practically everything right out of the box. However the reality is somewhat different. Prior to purchase I was using Apple Home and a basic Home Assistant setup through a Raspberry Pi to integrate stuff to AH that wasn’t natively supported. Everything native in Apple worked, the HA integration was always the stuff that caused an issue.
Partly my own fault, I should have done more research, but I was attracted to Homey Pro as I watched a few YouTube reviews and also the marketing that implied it worked with everything and it all worked locally if the internet went off.
So I spent £399 on the Homey Pro and set it up. Immediately I ran into issues.
In my eco system I have Philips Hue, Meross, Sonoff, Tapo, Reolink, Frient, Nuki, Sonos & Tado°
Philips Hue - All lights went in no problem. However can’t seem to find an option in Homey Pro to use the adaptive lighting (that changes the colour temp throughout the day) that was available in Apple Home. I also can’t group lights together without using a 3rd party app 
Meross - Allegedly supported, which it is to some extent, just not the plugs I had. So had to use an old Alexa to add the Meross plugs into that to then import into Homey Pro
Sonoff - As with Meross. Some support just not the devices I had. So back to setting it up through Alexa
Tapo - Same as Meross & Sonoff
Nuki - Went in and works.
Frient - Went in and works
Tado° - Went in, but don’t really see the point of it as I use the Tado° Assist feature which works flawlessly and now has offline scheduling that will keep the schedule working in the event of a loss of internet. Never really explored if it would work in Homey.
Reolink - Pointless integration. You can’t live stream a camera, just see a snapshot using ONVIF. So removed from Homey Pro.
Sonos - My speakers are in but it’s pointless as I can’t start anything on it as I can’t see my Apple Music library to do so. So all I can see is if any of the speakers are in use or not.
Then we come to flows. Basic flows are limited, Advance flows are quite difficult for a new user to get to grips with. I’ve watched plenty of tutorials on it and it still takes me a while to sort out a flow to do what I want.
I am persevering with it because I have invested £399. However the thing that irritates me the most at the moment is the stability. Sometimes my flows will work instantly when using Hue Switches and Motion Sensors. Other times there will be a lag with some lights turning on/off straight away and others taking 3-5 secs to switch on/off.
I often find I have to reboot apps like the Alexa App or Groups app when things stop working.
Overall I am very disappointed with it. I would most certainly not recommend it to anyone and have even told people not to buy it when they have asked as it is not an easy system to use for the less technical.
I guess if you only had Philips Hue then it would be great, but then it would be pointless as you could just use the Hue app.
Athom need to concentrate on sorting out the bugs, stability and responsiveness.