I did mention that I only started 2 years ago. None of my devices except the hub are older than that.
For Z-wave (again all are Z-wave Plus, all are mains powered), I have a mix of brands. Mostly Zooz, a few Levitons, and one GE.
When I swapped out Z-wave for Zigbee, I did it in a way that I thought would create a strong Zigbee mesh. No concerns for brand. As it happens I think what I removed were all Zooz. However, I reinstalled some of those in other parts of the house and more than half my installed Z-wave devices are still Zooz.
I bought my hub about 4 years ago in anticipation of building out the new house with all smart lighting. We built the house in beginning in 2017, moved in mid 2018. Due to a recalcitrant electrician, smart lighting wasn’t part of the build. So I’ve been doing that myself in dribs and drabs.
I did start with the Classic App because it was pre-installed on my Samsung tablet. I was never particularly enamored with the old app and moved quickly and almost painlessly to the new app.
Things went along very well for me until I got to something over 20 Z-wave Plus devices. All but three were in the great room. Then I started having slow response despite having 100% local execution. And also was seeing lost commands. I have Scenes to shut off lights in the great room. After much trial and error, I split the room into 3 scenes and use an Alexa routine to run them with a 5 second delay between. And even then I have a complete repeat of all three scenes because lights get missed (lost commands?).
Probably too much information. I tend to run on…