Funny you should say that. I've just done it today.
The reason was because I've started using the pole "clampless" and the 5 mm hose sometimes gets folded over and stops the water. The reinforced hose is much better for "clampless" working.
For those who use clamps, just try it for a while and see how it works for you. Give it a good shot - 4 or 5 houses - and see if it doesn't save you lots of time.