Least important doesn't mean not important.
Nobody's saying it's not important. But it's tough for it to be "too important" when it's the least important of the four categories. And not by only a little.
Lies, damned lies, and statistics.
I agree that you have to strike at a level of proficiency to arrive on the green to make putting matter. However, once accomplished, it is ridiculous to say putting is the least important aspect of the game. I understand Mark Broadie, I understand shot link, I understand. The first question I ask someone who is putting poorly is where are you putting from? Real life experience tells us putting is where the game begins. Like of all of golf, it comes down to an individual basis. The statement that putting is the least important area of golf tells me you are speaking to a very small portion of players- and specifically those that are severely limited in their ability to strike a ball.
To diminish putting is to diminish scoring. To the individual, that might be the case; go ahead- go out: swing away, walk, be with friends, be alone, smell the roses; whatever you please.
If you wish to score, to play a complete game, you must putt well. You mentioned Scottie, who didn't hoist a major this year, and lost the Match Play in Texas because of his troubles on the green (despite hitting it like a God). He fiddled around with new putters, and practiced is tail off to be better on the greens. I doubt he would agree, for him personally, that putting is less important than driving the ball. If you are top 100 in the world, you are a very good putter- to use professionals as examples to defend an argument at large is not fair, for a variety of reasons.
What's more is putting is something most golfers can actually improve- and I assume that is what you teach with AimPoint, and why you likely believe in AimPoint. It is very, very hard to make adjustments in full swing technique after playing golf for an amount of time, especially in adult age. It is not very, very hard to make adjustments in speed control, and putting mechanics.
What Every Shot Counts shows us or the apps that help understand better shot selection, is how you make putting matter. Sometimes it means being aggressive, sometimes it means being more conservative. For the challenged ball striker, for example, it may mean you find a way to keep the ball in play as you move down the fairway using more loft and less speed, and choose a shot closer to the green with a more predictable pattern, giving you your best chance to two putt. It may mean you push the ball as close to the green as possible to give yourself the chance to approach the green with a land angle and spin rate that gives you the greatest chance of achieving a proximity to the hole allowing for a one putt.
Jackie Burke reminds us they give the trophy on the green, not the tee box. But in the end putting is not more important than any other play, it's just not least important- it is equal, like all parts of golf.
To the original question-
When we play tournaments in the MET Section- when the greens are lightening and tons of slope with hard hole locations, almost always there is trouble with pace of play. If you are playing stroke play, I bet an expensive dinner that there is a direct relationship in green speeds and pace of play.