I don't see any advantages to this update so far, but I'm seeing the same issue Gshani is with tracked changes going in one column and comments making an absurdly inefficient third column off to the side instead of changes and comments going in one nice merged column like they used to.
Seriously, whoever at Microsoft is reading this: this new "feature" appears to not have been tested by anyone who actually uses Word comments for serious editing. I laughed out loud when my office got an offer for discounted Office 365 for personal use-- if I ever need Word at home again, I'd rather spend weeks finding a legitimate version of Office 2019 and keep that for the next decade than subject myself to more of these terrible, untested changes being shoved into updates with no rollback option. Check out the comment from Martin_B_MBF above. He hits the nail on the head with how much inefficient clicking and workflow disruption the new system has introduced.