"Usually people who tend to be good at forms often have an inclination to fight"
My experience has been the opposite. At tournaments, there always a group walking around very proud, doing jumping spin kicks in the wings and swinging swords. Then, they all quietly go and change, gather their stuff and sneak out as the begin calling fighters to report to individual rings. Happens every single time. Though there are those that do both.
Forms are fun! Forms do have things that they can teach. It's the intent behind them. But five months of forms do not equal one day of training a principle with a partner.
Yes, some forms build internal but I'd be very careful with that. I've heard it my entire life. Not until training with my present teacher have I actually felt this thing I've been told about, and again, it has more to do with isloating a single posture, or one movement and holding it or doing it over and over.
These debates are silly. Because in the end, everyone will do what they want to do.
As for shadow boxing. I do it. But it's a way of oiling the machine, insuring all the pistons are firing as one ... as they should. It's not a reinactment of holding back the Qing at the burning gates of shaolin.
Some folks need this sort of thing to be inspired about their training. The Monk Spades and Tiger Forks and the jackets and the special, secret coded bow into and out of the forms. I know. I studied Hung Gar.
Now I'm inspired by the simple fact that I can walk past Times Square at 3:30 a.m. with a little groove on and feel like the badest guy on the block ... .... knowing all the while there's always someone out there tougher, perhaps armed, that I need to be training for. That's it. Pure and simple. Is your training turning you into a beater of fighters? My training took that turn about 5 years ago. I can say, before that, I was fooling myself. I still have a long way to go.