One difference I have noticed is that it used to be when I said "five minute timer" it would maybe ten percent of the time hear "five minutes timer" and decide it should search youtube for matching videos. Nowadays, it seems to treat "five minutes timer" and "five minute timer" as equal, but I get more silent misses where it ignores everything I said.
On the other hand, I gave up some kinds of requests. For instance, I used to try "start directions home" when I was driving and it would say "here's a route I found, do you want to start (or some such)" and there would be no way to actually start the directions home without breaking the very expensive law against touching your phone while driving. Does that work today? I don't know, because I've mostly been driving with Android Auto in the last few years and my wife's been in the car on the rare occasion I haven't. But it seems like the Assistant team could straightforwardly improve it.
On the other hand, I gave up some kinds of requests. For instance, I used to try "start directions home" when I was driving and it would say "here's a route I found, do you want to start (or some such)" and there would be no way to actually start the directions home without breaking the very expensive law against touching your phone while driving. Does that work today? I don't know, because I've mostly been driving with Android Auto in the last few years and my wife's been in the car on the rare occasion I haven't. But it seems like the Assistant team could straightforwardly improve it.