"NOW is something is not good enough to release when apparently it was good enough back then".
I don't think this is what anyone has said.
There is a bonus disc for each album, containing mostly never before heard writing, demos, home recordings, alternate takes. The aim for these sets was NEVER to round up all the stray tracks that appeared on CD singles, soundtracks etc. I'm amazed at the stunning opportunity fans now have to trace the development of songs from composing demos and early takes , and to peak into a favourite artists archives and hear gems and works in progress. If the reissues simply rounded up odd tracks previously released I'd be weeping.
She's Not There is not too hard to track down (Crossing, Other Enz CD's and online easily enough) .
Surely no one is suggesting to bump never heard demos to make room for a previously released cover? I personally find She's Not There a fairly pedestrian take on the song. Ok but adding nothing to the original.
If I had my way I'd remove the Byrdhouse tracks too! and add more demos!