Although I have years of working with Insteon, I am a newbee to SmartThings, so take my opinion with a grain of salt.
I started out with the new SmartThings ‘Connect’ app, and had fits trying to add Z Wave stuff, everything was a chore. Then I happened across the older ‘classic’ app, and what a difference in how much smoother everything went.
As for ‘connect’ how do you add/control users? Where is “Rooms”? When you have 20 - 30 items around a house ‘rooms’ is a must to keep your sanity. And I see nothing in the way of any kind of customization for individual look and functionality.
The pointy head people should at least match the capabilities of and old software before then release a ‘new and improved’ replacement.