I prefer the static ones too.
However they are an aquired taste and vey impractical!
On a 2 door (eg a convertible) the seatbelts end up under the front seat when someone gets into the back. Then when you sit in the front, your weight on the seat prevents you from getting the belt back so you have to get out of the car to retrieve the belt from under the seat.
Additionally they are fine if the driver/passenger are always the same size, but if your kid/s are occasioanlly in the front or if the passenger varies in size they have to be manually adjusted and that is a lot of wasted effort.
One female friend of mine was well fed and rather 'Jordan-esque' in the seatbelt area and the belt fitted when fuly adjusted out. I then gave a lift to another friend who was mortified that she could almost push the seatbelt to arms length!
I guess it's a similar difference between adults and young kids so I could imagine someone growing quickly frustrated of spending a few minutes everytime you had a different passenger.
Also some people seem incapable of working the extremely simple clasp! Silly, but I find that frustrating, as they still don't get it after you've shown them

And Finally - the static belts rarely extend far enough for a baby seat (not a problem for me so far, but had to change over when my sister used my Minor for a few years)
So althought the modern inertia belts are a bit unsightly, if you are going to carry a variety of people and/or frequently have passengers in the rear seat I would recommend them.