You do realize that the new keyboard is not yet available? I am pretty sure this isn’t a case of Apple maintaining a review embargo on the New keyboard folio. It would be more likely, if we weren’t 5-9 weeks away from the actual launch, so complaining that none of the reviewers are sharing thoughts or info on the new keyboard shouldn’t be surprising.
Same goes for the reviews of the iPad Pro’s themselves. I think it was MKBHD that said he’s only had his review unit for a couple of days, so again, it’s not surprising that there is limited testing done - especially when you factor in the upheaval we’re all experiencing due to the Coronavirus. YouTuber’s are no different, in dealing with the change and uncertainty, so you might want to cut them some slack right now as they figure out how to deal with the situation.
As far as anyone carrying around a trackpad with their iPad Pro, first of all, right now most people are not traveling with their iPads...or traveling at all, so it’s a moot point. I don’t think Apple is suggesting that anyone HAS to carry around a Magic Trackpad 2, but I can say that for me, the new cursor driven input is fantastic, especially when I’m at my desk working. I’ve actually pulled my iPad Pro 12.9” out of the old keyboard folio and have it on a stand on my desk, using an old BT Apple keyboard and new Magic Trackpad 2, plus Pencil, and it works great. When I want or need to get up, I simply pick up the iPad and use it in full touch mode.