I think they obsessed on keeping the size down. I don't know how many mm's a tilting screen would add but I think for Sony any added thickness was too much.
With the A7c range being small I struggle to see the point of APS-C now for primes in the 24 to 50mm range. MFT can still offer some real savings in bulk and weight but only with
second hand kit as they've stopped making the GM and GX ranges.
I've never been particularly interested in cameras but that's spreading to lenses now and I'm getting to the point that I can't be bothered trying new kit. I've been thinking for a while that I want to get back to something more like the simplicity I had with my film era fixed lens compacts but trying to keep the IQ of Sony FF. The Panasonic GM5 with 20mm was very nice but with limitations, the GX80 and 14mm is nice but with limitations, the A7cII and 40mm is very nice and although it's bigger and heavier than those MFT cameras the biggest annoyance so far is the articulating screen. It is the way forward for me though despite that. I'll have to think if I want to sell the a7III.
On trading and selling stuff.
I'm thinking about selling my Voigtlander lenses. I've used Ffordes a couple of times and the experience was really only tolerable and I did sell one Voigtlander to Wex and the experience left a bad taste in my mouth. Can anyone recommend anyone to sell my Voigtlanders to other than Ffordes or Wex?