Actually the heat cycling is a hang over from the cast iron pistons and was absolutely necessary if you wanted a good engine. I believe some of the smaller Enyas still use a cast iron piston so be aware of this if you buy one.

Another point of interest is that over time the brass liner will develop a bell mouth at the top because when hot the expanding cylinder head strains the brass a little at a time. This doesn't happen with an AAC though. This was something that George Aldrich discovered.