Because most PB posts take about 4-5 years to build steam.
These forums aren't built from the excitement that they had 20+ years ago - and yes, I'd know - probly the only old timer left in these parts (almost 25 years now) - young guns like the ticky-tockies now. They don't like conversation - they like being TOLD what/how to enjoy by some influencer.
Nobody has the patience to build anything great anymore. If you want trails, try trailforks, or Wikiloc. What do you seek, from said app?