I have an a7rIII. It has a touch screen. I turn the touch screen off because accidentally touches while the camera is hanging from a strap will put the focus point somewhere crazy and it screws me up when I pick the camera up to shoot. Honestly when shooting seriously via the viewfinder, the tactile feedback of physical buttons, knobs, and sticks is more important.
I'm not buying the a7rIV right out the gate because I don't need 61mp, and there aren't any substantial upgrades other than resolution vs the a7rIII because quite frankly, the a7rIII is still more capable than most cameras out there.
But buying a 61mp camera and wanting to shoot in mRaw because the files are too big is a waste of money and megapixels IMO. If 61mp files are such an issue, there are plenty of solid Sony mirrorless cameras out there. a7III, a7rIII, a9 are all 'old' models, but still more capable than anything Canikon is offering and are attractively priced at this point. A7rIII is only $200 more than the EOS R right now and it will likely be discounted further once the a7rIV hits the streets.