It isn't the core that is the problem, it is the 'everything else.' Ideally every runner can have a reasonable chance of doing things like:
- sneaking past a dozy guard with headphones on,
- climb a fence
- run away at a more than a moderate jogging speed
- deal with important people without outright insulting them or making them think you are a complete idiot
- do legwork of some sort, in some way
- contribute in a fight
- notice the orc standing behind the curtain, find the car keys stuck above the sun shade, or find the commlink under the sofa
With this build, I'm finding it hard to cover all the usual bases ... so it becomes a question of having really weak dice pools in most of them, or being half decent at a couple and leaving most of them in the 'just not going to happen unless we have a troll who can lift me over that fence' category. And knowing next to nothing about the game or the other players, have no real basis for deciding which are the ones that most need coverage ...
For someone who likes to analyze and coordinate and plan for contingencies, it makes it hard to decide!
(do note, this is just me kvetching, not a serious complaint).