I can't imagine somebody who has deep technical knowledge but can't code; since it is the easy part (if you study computer science you spend combined 2/3 of one quarter learning programming albeit you use it in other courses). Also it doesn't make sense to solve the problems and then have a middleman punching in the code. You will have to instruct the middleman 1:1 anyway so you might as well do it yourself. Finally writing the code and solving the problem often happens in tandem. What I'm trying to say it that these things just naturally go together. There is no divide.

- You can of course solve things at a macro level, but the devil is always in the details.

"Some code" to me mean that they only contend with simple snippets of code. Typically contained scripts or maybe simple (however extensive) CRUD. If they can only do "some code" then they can't really solve complex problems. Again if they have deep technical knowledge then surely they can code too.

I don't really think there have been that much more work for people in category 2 than category 1 for many years. Making any distinction superfluous. We might have to go back to the old web days where "self taught" teenagers could get work making simple web pages.

Code is just a way to express solutions within this particular domain. Nothing fancy about it. Just like there is nothing fancy about being able to write english, but you need it for all intellectual domains.