This topic is a bit of a crap shoot, but I'll suggest a few thoughts for your consideration.
My personal preference is to ditch the gauze filter in the tank and go with a plastic see through in line filter for a number of reasons.
First, you can always have a quick look at the filter whenever you have a mind to and "see" any debris in the filter. You can judge your gasoline supply stations based on what you "see".
Second, If you've ever died on the side of the road and couldn't figure out why, the option of bending over and looking at the fuel filter right then and there is a valuable diagnosing tool. If the fuel system is starving the carbs, when you pull over and look at the fuel filter, you'll "see" fuel flowing slowly through the fuel filter and that tells a story.
Third, If by chance you pick up a bad load of fuel and you end up on the side of the road, you can always turn off the fuel tap and pull the in line filter and blow it out in the reverse of the flow and blow enough crap out of it to get yourself back on the road. That has saved my butt a few times.
Leaving the gauze filter in the tank will save any wear on the pingel tap sealing faces and that's a good thing. The major problem is most riders never take the tap out of the tank and check it for debris and clean, which opens up the opportunity for starvation of fuel producing a lean mixture condition which is not good for the engine.
Like I said, a crap shoot. There's 2 sides to the argument and hopefully I've voiced both sides.
