Yes they still would be needed, The reason they are needed is they are known has decoupling capaictors, Thelp help prevent noise which could effect the pic or any other part of your curcuit it aslo helps out with the EMC rules, The normal rule every IC is best to have a 100N(.1uF) cap has close has possible to the IC power pins.

There may be more reason but these are the simples ones