User's choice, at the end of the day. I've recently introduced myself to pre-shave after deciding I was getting too much irritation in places (though that's probably down to use error, as well).
In short, it provides extra protection/slickness from the blade. Some people swear by it, some people will have nothing to do with it. Preparation is where you'll notice a big difference, and technique of course.
Hope this helps! (I swear I'm not following you around the forum...)
The only pre shave I use is the small amount of "Bloom water" of the top of my soap before I lather my soap.
It would only get wasted otherwise, I don't know if it helps much but I don't like to just throw it down the plug hole!
Myrsol Emulsion improves any shave I have whether before or after. The late Mr Myrsol even used it for shaving. Applied prior to shaving and left to soak in for a moment or two I feel it assists to prep my skin and adds to razor glide, which is already good when I use Myrsol blue or 1912 soaps. But that's a very personal and subjective viewpoint.
Good point really! Because I watched a few videos before diving in I bought a pre shave oil, have not tried shaving without it, I am a blatant commercial sucker, if I'm told I need it I buy it.
Tomorrow's shave I will try without it.
Report back later.