Do you really *have* to mortise for hinges and other door hardware?
Well, let's take hinges for example. They typically have plates 3 or more millimeters thick and with two such plates it means you need a 6 millimeters gap between the door and the frame to accomodate the hinges. Do you really want a 6 millimeters gap? It will conduct noise, let unwanted cold/hot air through the door, it'll be very easy to put a crowbar and break the door open.

If you don't care of having a huge gap - no problem, you can install hinges without making mortises for them.