I'd never fall out with anyone over it. But, I see naked bikes like the CB750 (Enfields, Z900RS etc.) with significant money spent on fairings, saddlele bags, saddles, even sissy bars and bar risers etc. I can't help thinking that money could have gone on getting an old Harley. Then you have the best of both worlds. Naked classic sports bike one day and utility / cruiser the next. And you're likely to lose less of your investment when you come to sell. But fair enough, their bike and money.
The only time I wince a bit is when irreversible changes are made to a a good bike. But again, their bike, their vision. Also, one less to compete with mine when my family come to sell off the old junk in the garage!