Do you really need to know exactly how far above the runway you are once you've done the flare and are now just 'flying' the aircraft until it can't fly any more and settles onto the ground?
Do you need to know how far you are behind the car ahead of you on the highway?
Do you have to know how far you are away from a wall you are parking beside?
Of course you do, and you should know exactly how high you are above the runway all during the landing process.
At least that is my opinion.
(I'm assuming you can tell the difference between 2 feet and 10 feet - i.e. you know if you've flared way too soon and ended up too high)
Once again to be a proficient pilot you must know your height above the runway at alll times until you are on the runway.
Why is this question even being asked?
For me personally I can judge when the wheels are six inches above the runway.
Some years ago I posted a detailed explanation on how to judge height and where to look during the approach and landing.
I am on a trip across Canada in my motor home at this time and have limited access to the internet.
Maybe someone here can find my post on landing and copy and paste it here?
Chuck Ellsworth.