The tl;dr of it is that if 50% + 1 of a workforce unionizes, the union bargains collectively for everyone. Even for free-loaders who don't pay union dues.
This is like being able to opt out of paying taxes, while still receiving all government benefits. If that were legal, then our public services would collapse by next week.
Thank you for the information. I don't understand legalese that well (many colloquial things mean something different in legalese) so I will take your word for it. That changes my view on RtW