Papanate - that's the thing isn't it, Blumlein just used binaural - as in two channels, one for one ear, one for the other and for a specific purpose. But we now talk about recording things in stereo without really understanding what we are talking about. I think I mentioned it a long time ago, but when I was still at school, my dad got me a few little jollies to studios through people he knew. One, was in Stockport (near Manchester) and it was a big band session - in stereo, when stereo was very new. The saxes and clarinets were in the left channel, the trumpets and trombones, the right, and bass, piano and drums centre. Not real at all - but damn impressive. The studio was more famous for being where 10cc recorded I'm not in Love.
I used to buy LDCs from a chinese firm - this was before aliexpress days, and they were vaguely U87 shape and had cardioid and omni. I sent them a photo of a Neumann SM69 with the rotating top capsule and asked if they could make anything like this? They sent me a pic of a mic that was tubular and had 3 patterns and said they could add a top. I had to buy 5 - the total was about £1000, and a huge risk as I needed to pay up front, but I held my breath and wired the money. I sold the other four, so effectively, the mic cost me nothing. A year later I tried to buy more, but they had given up making microphones and moved into catering equipment - using the mesh material for sieves and filters! Inside, brass, and brazed joints - real hands on stuff.
My mic has a 48V power supply which also converts the 5 pin XLR male to female into 2 x 3 pin male XLRs. It's quite good on guitars because the two elements can be adjusted to whatever you need to get the usual two different sounds for blending and panning.
