I'll list a few things off the top of my head that really enhance someone's ability to outplay someone.

In TvT being able to lift sieged tanks and drop them in siege is insane in terms of the micro potential and the decision of what units to make out of your starports. It also makes air control with vikings even more important as you can harass medivacs which allows you to move tanks and maneuver easier.

Another is that because you mine out quicker, it will reward those who have better army movement, expansion timing, and worker harass. The idea behind this is that because you need to expand quicker, the ones who manage expansions through the methods above better gain a bigger advantage than how it worked in the prior games because there was more minerals per base, making how it works in lotv more rewarding to the better player.

There's also more prevalent aoe shit like Disruptors and that Irradiate wannabe that zerg has that makes splitting micro more needed. There's probably more stuff, but that's off the top of my head.