Not speaking for others, but "the problem" with ISO, is that it is a be-all and non-specific.
My customers mandated me to have it, so I revised my QA manual, hired a consultant for 2 days, we applied and received.
There were 2 of us in the company (total) at the time.
When I sold the business, there were 4.5 and we were a gnats chuff from going for AS (all I had to implement was a full stock control for materiel stores).
It's not a big deal.
If it's a mandate from your Customers, you don't have a choice, so you do it or change customers.
BUT, IMHO, it's not really suited for manufacturing (see attached)....
Some of my customers (before I went for it) insisted that I had to have ISO9000 or lose their work. I said fine, get on your bike, I will see you in a fortnight. The reply was no chance. Sure enough I would get the call, can we discuss this? I replied that there was nothing to discuss, we do it my way or not at all. But we cant find anybody else to make our cams. OK I will make them, but stand by for a price increase.
Other customers said just carry on, make them under our umbrella.