Quoth Daniel Sullivan
Some guys just like forms.
Sounds like me.
Forms are a useful part of training. Some are just a means to teach/ practice strikes, blocks and kicks.
Some are more complex and contain more complex techniques.
Some also encapsulate strategy with the strikes etc being more illusion or secondary to the true use of the form.
Some also emphasise body movement and teach different sorts of flow and shifts.
If, like me, you are a long way from your club, then forms can be a useful way to continue your training. They are hardly anything like complete training, but in many ways, a forms curriculum can represent "complete training."
OTOH, the points about forms not being native to Hapkido are important. Inherent to the assumptions underpinning this argument is the insistence that change is not good.
Certainly change for its own sake isn't good. But if forms bring added value to training then why not bring them in? If they don't then leave them out. Each system and school is entitled to their own choices here.
Perhaps a useful approach is to make note in the teaching process, that the forms are not original or native to the system?