2air-
I've only been to one LDS, stopped in passing and noticed the fill station is "in the back" rather than adjacent to the retail area. I found out sometime later, that particular LDS did have a tank "explode" in one way or another some years ago, apparently a question of consistent owner abuse that just caught them lucky. So perhaps containment stations are like seat belts: Some people just think they are cumbersome. There's a lot of that going around.
Professionally trained highly accredited alleged experts of all kinds, from brakes and front end mechanics to plumbers and appliance repairmen, these days? Everyone rushes the job and tries to make more bucks. There's little pride in craftsmanship to be found anymore, at least not in the US. In that sense, sadly, why should SCUBA be any different? The big organizations sell the dream of "Work at what you love" and there's a constant turnover of new shops opening, new rubes burning out, new shops closing in five or ten years as they realize it can be a grind and not very profitable either.
Heck, a lot of big names (New England Divers, anyone?) have gone by the side of the road too.