Indeed. Heels on acoustic guitars, violins, etc. have physical strength from the heel to the front end of the body and are therefore constructionally useful, but for solidbodies - why? Teles and Strats don't need heels and are perfectly happy joining to a pocket in the face of an instrument rather than the front end, similar to acoustic's dovetails/tenons. Heels do look nice however and give plenty of opportunity to embellish an instrument :-D I really like it when a contrasting set of heel woods are added as part of a smoothed neck transition and blended into the body giving interest to the look. I digress.
As everyone else says - gluing up to the back of the neck pup is more than enough if done well, heel or no. Once the neck pup cavity has been routed, the constructional (and tonal? heh) value of going any deeper lessens as you've eaten most of the tenon. The Myka jig will give you excellent results, and with a little care a VERY tight neck pocket. As David says - you should be able to pick up your instrument by the neck without even gluing up with a tight pocket. Just don't make it too tight and split wood off the sides of the pocket of course!!
Happy building, and do document your progress of course.