To have balance is everything. I am so agree with you but due birth defect on one of my feet's I have no balance on one leg. Cannot stand one leg more than 5 seconds. All those training requires balance. Without balance you will loose every fight in the end. But again your advice is sound for 99.99999999% of all the people. Sadly I belong to the 0.00000000001% part of them. 

Balance is the key in life.