You can make them separate questions rhetorically but it doesn't mean they need to followed up on as such. It's pretty simple...

Most of the time? Well it includes the word most, so yes.

Most of the tasks? Well it includes the word most, so yes.

Such is a common way of writing. Think of it as a kind of compression. Researchers consider the rhetoric more than you want to give them credit for with your knee jerk "I don't personally understand so these researchers are idiots" ad hominem.

Models do contain a mathematical happy path to answer most questions that have been asked and answered when the model was trained. The issue is not whether those answers exist but finding them. That's what the bulk of the bleeding edge of model work is focused on atm.