I don't know who actually designed the various trails that have been created the past couple years, but I think it is a collaboration of various groups in an effort to create multi-use trails. There seems to be a cooperation between user groups like there never was in the past. So, there is likely some 'give and take' to accommodate all trail users. I know for a fact there are MTB users very involved.
I have also ridden that area since before the new 'Redback/Hutchinson/Munsee Eagle' loop was started. Personally, I feel like the riding has dramatically improved. Sections of Redback used to be completely washed out un-maintained fire-roads which were total HAB. Much more single-track was created. Where Huthinson comes in by the caretaker lot used to be all fire-road (no single-track) and it was completely swamped out as you approached the northern end. Munsee is all new single-track and provides a connection/loop that didn't exist. For those of us who know the old stuff, there are some additional connections this now presents so you can mix in some other lesser used and more "rugged" trails. Others are just using this loop.
I do see in some spots that where multiple lines are popping up, as you remarked. In some cases I totally see that one line is the hard line and the other is an easier option - so that's cool. Other cases there are just 2 routes of equal difficulty - so maybe not really needed. An example is on Munsee where there is a switchback with a line right through the middle of the S, and then 2 similar difficulty lines right after that. Do I love that? No. But, it doesn't really bother me.
Anyway, you certainly have a right to your opinion. Perhaps you are already involved in the building/maintenance. But, if not, the crews are getting active again now, so maybe you can participate and have a say.