Tek , the pot is not adjusted constantly , maybe 5-10 a week , good quality trim pots last a long time and can be adjusted many times without failure ( I have a test unit that is 6 months old )
Having a name like Tektronik I would think you of all people would be all over something that is variable ?? were you a troubleshooter in a former life ?? LOL !
As you know the quality of the components is Key , and the build quality.
Anyhow being able to adjust the voltage is liberating IMO , also the regulation gives you the same Power every time ( considering that the res. is stable ) .