This may be true, I don't know. I am only conveying what I have heard.
What I will say is that the abuse that a tank filter in an RC airplane gets vs the typical chain saw is different.
A chain saw will not experience 5 G's while a RC plane will. This force can slam the clunk against the side of the tank.
I don't know, I am not for or against using them.
I use a weighted clunk with a screen filter in it.
I use a filter on the fuel jug, inline and clunk filter.
I then also use a filter before the carburetor and on the vent line.
Is this overkill, YES.
Do I have trash in my carburetor, NO.
I have heard that the felt will/can come off over time and get sucked in to the carb or inline filter.
To this I say BS. Felt clunk filters are standard equipment on millions of weedwackers and other powered garden tools. The clunk filters are designed by companies like Walbro, who make the carburetors for many of these engines. If clunk filters caused carbs to clog over time, they simply would not be present on millions of OEM garden tools.
I believe the junk that people find in their carbs is caused by using a !QUOT!T!QUOT! in the fill line, not by the clunk filter. When filling, they are putting the dirt on the engine side of the filter.