You are right it is not relevant and I realized it back when we played FCS but hated we did not have more coverage. If not for NDSU dynasty being a big story and them beating P5 teams nobody would talk about FCS. That, money limitations, and knowing we were gonna end up playing a bunch of private schools instead of schools like us was why I wanted to move up. I watch FCS some and appreciate it but overall the division really does not get much attention.
Could you imagine being a NAIA or D3 school fan? They don't even show the NAIA title game on national TV anymore and the only D2 games on TV are the last couple rounds of playoffs and depending on your region you may get some on local TV. National TV really does not care about anything but FBS unless the FCS team is playing a FBS team or it is the last couple rounds of the playoffs.