Can all surgeries be done laparoscopically in order to minimize scarring?

No. While more and more procedures can be done using "minimally invasive techniques, " the goal of any surgery is to treat the problem, not to ensure the best cosmetic result. However, all things being equal, laparoscopic approaches do offer faster recoveries and less scaring.
No. Depends on the type of surgery. It would be best to have a procedure in mind and then ask the question.