I don't know what the stink would be with a phenolic collar, if it's a flat faced joint like 3/8 x 10 pinned cues have with the wood directly drilled and tapped in the shaft, that's for increasing the feel of a cue...if there is wood between the collar and pin that is...
If someone bores out the end of the shaft and then puts a core of phenolic in there for the purpose of strength I think it's a complete waste of time...IMHO
How many shafts have stripped that are not the result of abuse or stupidity....the flat faced 3/8 x 10 joint is the only one I use BTW.....
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