Some people are all anal (giggity) about having 100% filtration at all times. The reason I usually see is that they 'don't want all the crud in the oil pan getting into the engine on startup'
In my case my engine doesn't have crud on the bottom (and my pump sucks off the bottom even after start up). If you have a pan full of crud, you don't need a block bypass, you need a rebuild.
Blocking the bypass will not increase flow and it will most likely decrease it as fluids like to take the path of least resistance. There's not a filter media made that will outflow a straight shot around a filter media. If the pump has the additional capacity to work with, you can shim the pressure relief spring, load the pump harder and get the PSI back at the pressure gauge. Oddly enough this extra pump load with put addition strain on the bevel gears, timing set and cam sensor. (three things that AREN'T pressre fed, but splash fed)
I will agree 'the idea' of 100% full time .000000000001 micron filtration sounds like a good idea on paper. But in a real life street car it's not necessary.
The potential benefit of catching stuff at the exact instance of a catastrophic failure sounds good. But a real life a catastrophic failure is going to tear stuff up whether you've blocked the filter bypasses or not. Since those kind of failures don't happen that often in the grand scheme of things, it's risky to do, because of the other side effects from doing it.
Let's say you're WOT at 125+ and your filter seal blows out from a blocked bypass.... At that point do your really care about 'all the crud in the bottom of the pan'? Not to mention in that example oils not going to the bearings like it's supposed to, it's keeping our back tires from rusting.
Or if you have a blocked bypass that filtered 10 pounds of 'crud' then it collapses and the media becomes compromised. In that instance you'll send a bunch of that captured crud into the engine at once.
this is just my opinion though. I've spent a little bit of time thinking about the oil systems in our cars over the years.... so far I haven't come up with one scenario where blocking the filter bypasses risk is worth the potential reward.
Now if you'll excuse me, I've got my Charlie Sheen outfit on, a cold Corona and it's time to get back to my sex convention and think about other kinds of fluid transfer.