This news came as no surprise. The National Trust now seems to feel it has a monopoly on how history amd the past = and the present should be presented to the country. No room for alternative opinions, never a shred of doubt that the NT is the one and only Truth and nothing but the Truth and those who deviate must be cast into the wilderness.
They have dumbed down their properties because we plebs cannot be expected to have any deep knowledge, understanding and interest in history. The NT so heavily brand their properties that, like M&S, it doesn't matter what the building is, the brand is identical everywhere and the building barely comes into it..
We have joined the HHA. Individual houses, still run by the owners and each of them individual, some nice, some boring, but always different and on each visit there is the excitement of not knowing quite what you are going to get when you get there..