I know what you mean Whirly. It may come from a belief that using carb heat would damage an engine due to over heating! I've heard this more than once.
I wouldn't recommend that you use it all the time though (unlike in an R22 where you could and can also use partial carb ht) simply due to the fact that the carb air is usually unfiltered and in straight and level flight light aircraft engines need quite a bit of power, again unlike an R22 which has a derated engine, so has an excess of power compared to it's fixed wing brothers.