I don’t agree with that, there’s been loads of maintenance the last couple of years and areas of recent felling such as pennel’s vennel and blue velvet have new surfaces.
There’s some truth in it- the maintenance at GT is inadequate and mostly volunteer, there’s exceptions like as you say Blue Velvet recently, Spooky Woods a couple of years back- both times after forestry work that made a rebuild really necessary due to the amount of trail damage.
Usually they take good care of the trails while working around them, and they just need patching afterwards (like former ewok village, a while back). The (rubbish) rebuild on Pennel’s Vennel was actually a repair for water damage rather than felling. (not GT, but the innerleithen climb’s a perfect example of how well it can work, they clearfelled a whole block but the trail was almost untouched)
But it is definitely true that the maintenance is stretched too thin… There’s talk of decommissioning less popular parts of the trail network. As I understood it the new trail we put in for the EWS that cuts down from Boundary to Deliverance was supposed to enable them to remove most of Boundary from the formal trail network, for much this reason. Though I’m not sure if that’s worked out as we built it a bit steep 🙂