I think that whenever reading up on techniques and someone says "do this, do that, blah blah blah," you should always preface it with "sometimes it can be a good idea to..."
There are advantages and disadvantages to every technique, and understanding them is what makes an engineer an engineer.QUOTE]
Absolutely true in my opinion.
Another aspect to this is that some mics just don't sound very good when the singer gets off-axis. A couple of inches either side of a 58 makes a huge difference in the sound so mic selection and placement is very important and experimentation is the key.
You don't have to compress a vocal at the recording stage but generally it helps and if you use minimal settings you can always compress it at the mix (or ride the waveform/fader).
If you have a nice sounding room to work in then a ribbon mic can be great. Being figure-of-eight you will get some of the room sound from the back side of the mic but be careful....too much room is not removable afterwards!
I sometimes put up a "dummy" mic for the singer to aim at and then experiment with other mics in different positions when I have the time.