[RFI] Is a low pass filter necessary?

[John]

I was on an antennas reflector recently asking about the proper placement
of a low pass filter and several members asked why am I using one at all.
They said with the modern radios (I have an Icom 706 original) a low pass
filter really isn't necessary, that most modern rigs already contain one
and the spurrious emissions are already greatly reduced. So, what is the
opinion of list members-with a modern rig, does having a low pass filter in
line really help to solve any additional problems?

John AF5CC