If you are going to add harmonies,or extra instruments, it's probably best that the first music recorded is done with a click track. Diifficult as it is to play fluently and freely with a clicktrack,it's even worse trying to add something to a live recording with its naturally varying tempo. In those circumstances, there's no natural spring in the rhythm,you're pushing or pulling at an immovable object, and it is a completely unnatural feeling to someone who is used to playing with other musicians. at least if a clicktrack was used to start with, the immovable object youre playing with at least has a regular tempo.
My own recording experience has been almost completely live playing, no click tracks.When I've had (or wanted) to do the overdubbing thing, it felt unnatural at first, and no fun atall. It's a completely new skill you have to learn, like anything else in life. i havent mastered it yet, but I'm going to carry on experimenting because it undoubtedly opens up intriguing possibilities. Like most folkies I suppose Im a natural Luddite, but the fact is there is a lot of fun to be had with technology if you're prepared to put in a bit of effort mastering the background skills. Let's face it, we'reall talking to each other here using wire and silicon and stuff.