Yes. Engineer is probably the most drawn out class in the entire game. They need almost every skill whereas like a Ranger or Warrior can stop buying skills after 30 SPs.
Mines, Bomb Kit and Tool Kit are not super needed. So can skip those till you find a pressing need. Although the wrench can be used to repair turrets. Something to consider should you wanna play what is the least effective Ritualist imaginable.
All the other skills provide the bulk of Engineer utility they are are otherwise missing from actual weapons.
There will come a time when 50,000 Krait are chain death gripping you in Orr. Yet you'll be like, "Cya, bitches! *slick shoes*" and suddenly that bugged SPC in Lornar's Pass was worth it.