I live in an area where most ‘open’ countryside is NT land so the trails and paths are all clearly marked. On any sunny day the world and their wives are out and about and happy smiley faces tend to win the day, avoiding peak times is the answer. Almost all of the permissives have trees etc across them and over the years the use of trees just seems to widen the track as everybody steps around them which seems a bit pointless tbh. Ive grown the habbit/hobby of seeking out deer trails, un-marked (as footpaths or bridleways) and usually good fun, some are short and not great, others are bang on. Walkers and horses tend to miss these as the trails often appear to pile into and through the undergrowth.
Ive met many vindictive golfer/dog walker types but not on these type of trails, using wire to block a track is mindlessly irresponsible, it could as easily break a deer or horses leg as tilt a MTB rider over the bars, un-believable