Tom wrote:

As for length there's a very good reason for the
dipstick tube to be extended well down the dipstick:
windage. How long do you think an unsupported flexible
dipstick would last?

I've got a couple that are pushing 40 years, and one that is 55. None of
them are supported below the entry point into the block.

The newer cable-type dip"sticks" may be different, but a traditional
springy dipstick doesn't require support for the few inches it sticks
into the pan.