[TYVets]

I have no idea why they messed up a perfectly good system.

It was done for 2 reasons.

#1 Safety

#2 Lawsuits

[Cvengr]

They changed to avoid people taking hammers and tapping on the side of an already malfunctioning valve under pressure.

[BobL]

“It was done for 2 reasons.
#1 Safety
#2 Lawsuits”

Can’t argue the Safety end. If you can’t get anything out of the tanks, then you’re almost assured of not having a hazard (unless you roast them, drop them, or shoot them).