Let's not discount the fact that I did agree with you that knowing your scales and all that theory jazz is of utmost importance as the first step. But then again shouldn't that be the first step in learning an instrument?
My main point here is NOT that we do not use theory or do not have to learnt what are the so called right notes to play.. but it is in trusting your own voice in your head and transmitting your 'feel'ing through your instrument.
So you've been practising your pentatonics, your major/minor, your harmonic/melodic, your pinch harmonics and whatever else... Knowing that alone, I personally feel is not going to allow you to improvise or solo in a musical context. ie with a band, with the radio playing or with the voices you hear in your head...heh, musicians all tend to be a lil looney lah...
We've got to train our minds to listen and hear for ourselves what's right.. and what works.. and what evokes the intended message you are sending out when you play... This in itself works on many levels and for sure, cannot be explained in a few simple posts on a forum.
Instead, what I am suggesting to guitarists who want to embark on this two-handed approach on wood and string wanking, is for them to make their own associations in their mind on what works and then stand and deliver a solo that is more meaningful than boastful.. Sure sweeping appegios, string skipping and the works all sound impressive.. but it'll all amount to nothing unless you leave the listener with something to remember...
If you know the notes to play, because you memorized some scalesm, you may just get away with it.. but I doubt that it'll have any staying power... Tell a story when you play, mean it when you play, and once again when it all comes together, you've got to tell it with some feeling. It's pretty much like a sales pitch.. when you see a customer and you truely believe in your product.. it exudes from your sales talk and you're likely to make the sale..
And for the record, I'm not here just to say this because I don't agree with you or because I want to be right.. I'm saying this because this is my mantra when I play the guitar and if you are willing, then listen..
Cheers!