However, with the possibility to queue all three training queues you will get a lot more out of your brown bear.
This is simply not true. You can’t get more out of your brown bear with the three separate training queues, as you could already collect all three training facilities at once after feeding the brown bear, you just had to train one facility after another and not collect in between, before feeding the bear. All you needed was some patience and careful manoeuvring across your city.
There is absolutely no brown bear advantage from the separate training queues.
Especially not since the time instants work on only one training queue at a time. Were the time instants working on all three queues at the same time, then yes it would be an advantage. But it’s not, so really nothing has changed for people with brown bears.
Only thing the separate training queues has done is (relatively speaking) devaluate the AWs that give free troops, as those troops can now easily be made in the training facilities, since you don’t have to choose between which troops to prioritise, because you can train three kinds at the same time now.