The only complaint I had is that it waited until 19 minutes had passed of a 20 minute estimate before telling me I could connect the phones with a USB cable and go faster than the wireless transfer.
Here not. It omitted settings, cookies and payment methods.
When the transfer was almost done, it told me I could use a USB cable between the phones to make the transfer faster. At that point, given how close it was to being done, I just let it continue versus risking an interruption to the process by changing media.
I'm sure there's some people out there who appreciate Samsung's duplication / replacement of functionality Android already has, but that's not me. My work-issued phone is Samsung and I'm not fond of all that extra mess.
Alphabet expects you to keep all your data in its products.
It has no incentives to create Android to Android transfer tooling.
And lots of incentives for it not to.
Good luck.