I think it's mostly because it doesn't directly help you win. There are very few instances where the ID is directly is directly causing you to lose, so the slots are better dedicated to what is actually making you lose. For instance if your CS slot is 2 pieces of ice, the runner can't steal an agenda, and thus can't trigger Leela's ability. If you had the CS, they might be able to just fizzle it by stealing an agenda since you didn't protect your RnD for a turn with the ice CS should have been. Or the economy you needed to rez the ice, etc.
Also Andy is a heavily played runner, and it is dead in that, one of the most difficult match ups already. That said, if hacktivism turns out to be as good as people are thinking, I do believe adding in a good current to cancel currents that hurt you very badly will tip it into playability.
If your deck only loses to Maxx and Noise because of their abilities, and maintains a high winrate with 2 slots changed, then sure, try CS.