I do not condone the ninety second clock - but in some situations, it is warranted!
By switching to putting mode when you have an approach shot, it lets you read the break lines on the greens.
Then there are calculations to reduce your lengthy putts, such as on St. A 5th (par 5) green.
If you are already a legend, then you pretty much know how tourney greens will work. But many players in stroke play, who are master (or lower), get into a game with a legend and are unprepared for the tourney greens.
Even with friendly players who will teach them the percentages, and there are many exceptions to the percentages, it really takes all the time they can spare to allow for distance adj, break adjustment, removing flag, switching to reverse view, then RE-adjusting .... and ninety seconds doesn't seem to be enough.
NOW - the reason I don't condone ninety seconds is because at WGT, it allows players to become automotons, unlike real golf.
Learn on the fly, as in real life, and the game becomes slightly more realistic - as in playing by the seat of one's pants.
Thirty seconds is ridiculously too fast, but 45 and 60 are quite playable. If they did away with 30 and 90, and maybe throw in a 75 bone, all would be right by me.
Any game I initiate (unless I'm afraid of losing masters), I specify 60 option.