Personally, I don't think it's my business to decide what is "allowed" for others to use and buy.
And, the only people I've ever seen take 30-60 seconds finding their distance weren't the ones with range finders....they were the ones without
So, alternatively, I don't appreciate being held up by a golfer without a rangefinder that can't find the yardage marker and decides to hit his 150 yard shot when he's actually 200 yards out....rinse and repeat (I'm not hacking on you, just demonstrating that the argument goes both ways.)
That said - I only found it useful once I had a bit of consistency hitting my short and medium approach distances within +/- 10 yards or so....and for larger distances, +/-25 (just for quicker club selection)
IMHO - use what you like, don't sweat other people's choices - it's none of my business what they use or not
I'm offering my opinion on a forum, I'm not making it my business what is "allowed" of not.
My opinion is that Lasers are being bought due to their increased accuracy.
My experience is that lasers cause more delay than GPS watches or rangefinders.
My conculsion is that if you're game isn't good enough for the increased accuracy to matter, then a laser is a "waste of time" on both accounts.
Re the highlighted part, that is my thinking, I'm addressing that, you are/were obviously of an ability for it to become useful.