Hi
Just my two cents
I would not remove bearings from any router bits, it's true that most router bits now come with a bearing(s) some are on top/center/bottom of the bit.
When you isolate the bearing you have taking the load off of it so to speak but it will still spin at 20,000 rpm but free of any load.
Some bits can not have the bearing removed like the T & G bits because they are being used a spacer for the cut and a stop point (guide).
But if the bearing is in place it will help with the snipe at the end of a pass that's to say you will not have a nick (dip) at the end of the stock when coming out of cut.
It's true that some bits have bearing on them for just the hell of it.
Plus If you take the bearing off the bit you take a chance that you will lose it and they are not cheap to replace not to talk about the screw that holds them in place.
A screw that's not tight will work out and take off across the shop or drop down into the router motor.
It's true that bearing have a short life but if you isolate it , they will last longer.
If the bearing is isolated right it will not touch the stock and can't pickup and errors in the stock when you run the pass. (like a nick in the stock or knot holes ) and the bit will/should remove the nick.
Have a good day
Bj
