yep, it was easier to learn. then various equipment companies jumped on with all the friction saver technology.
It became synonymous with working in trees, but the advent of friction savers were for 2 reason, to help do less damage to the trees, but for the most part, to make it easier

the various pulleys and now the pulleysaver are all to make DdRT easier, because face it, it is very inefficient by design...you move 1 foot for every 2 feet of rope you pull, if you go thru a crotch you are stuck with massive amount of friction, unless you put a redirect in, which may or may not be retrievable without having to go back up thru said crotch and getting it. this makes more work, takes longer and costs more fiscally and physically
Soon some pioneering climbers discovered the SRT really was more efficient.
then the experimenting began, finally culminating the the unicender and subsequently, the singing tree rope wrench.
Anybody who gives it an honest shot and is physically fit enough, will soon discover that they are working more efficiently , faster and with the proper planning, easier
Ever watch the petzl video with Jared Abrojena climbing DRT? he is awesome at it, but for work, it is rumored he is strictly SRT on his own rig
I climbed DdRT for a long time, and I find i get work done faster with less effort now, and that equates to less strain on my body and a heavier wallet...