If you only have an inline filter, it traps particles and becomes more restrictive over time and use. Therefore, it must be replaced periodically and be added to routine maintenance and bike check ups.
The in-tank stock Honda filter (on the petcock inlet) has a mesh fine enough to stop anything that can block orifices in the carbs. (Who cares if it can flow through the carbs and out the exhaust?) Plus the sloshing fuel in the tank keeps it clear enough to provide good flow (essentially self cleaning). If you get enough cr@p in the tank you simply flush/clean the tank.
If your selected inline filter doesn't have a mesh or media finer than the in-tank one, it won't trap anything and is effectually useless.
There have been reports on this forum of particles that defy physics, make it past the fine mesh in the tank filter, and are either trapped in their beloved in-line filter, or clog up their carbs if they haven't got the miracle inline filter.
They didn't report being members of the flat earth society, but I wonder...
Could the internet extend to alternate universes where the laws of physics are different than the one many of us live in?
Maybe in some universe the particles have sentience and have developed transporters to bypass Honda mesh barriers. I might guess, then, that in-line filters have Heisenberg compensator defeat technology so these smart particles can't jump those barriers and become imprisoned for all time. But, I digress.
Oh, and before you ask, yes I AM bored.
Cheers,