Regarding touch and tilty-swively screens...
(this is long, but perhaps has merit re: screen preferences)
I design things for a living -- medical devices, not cameras. In my line of work, when we run into preference proliferation where you have intractable 'camps' of users that must be satisfied all the time. We size it up pretty simply.
Scenario 1: The value proposition of the product we have in mind is good enough (on aggregate) to overcome the loss of that the one critical feature, i.e. the product is so slick, powerful, intuitive, effective that someone will willingly go against their core / gut beliefs to get their hands on the product. In this case, we just offer that one great product and tell folks to take it or leave it.
Scenario 2: The product isn't so compelling that people will go against a 'must' desire of theirs, but that camp of users is large enough to warrant a sister product / alternate version / new SKU that has the feature they want. i.e. Despite the time / cost / difficulty to satisfy this camp, it's worth it to do so, and we spin up the people to get it done.
Scenario 3: Scenario 2 with a smaller group that doesn't warrant standalone products to scratch their itch. Wiser companies drive around these battles and chase more lucrative targets. Smaller / more desperate companies to swoop in and fill the needs of these under-served customers.
Scenario 4: There are enough Scenario 3 groups that we entertain a modular solution to the problem. One core product is designed with 2, 3, 4, etc. versions of a single critical subsystem. Either you offer all of them to the market and the user assembles them, we kit them into different standalone SKUs, or we only offer one but design in this modularity as future proofing for a future Scenario 2 situation (i.e. if the market changes). Once that group gets large enough, we're glad we have a flexible enough platform to bolt on what they need as a new SKU.
I'm just wondering what the market segmentation is on touchscreens and/or tilty-flippy screens. I assume that the former is simple like/dislike preference, but the latter is a potential win for ergonomics at the cost of robustness (drops, hinge mechanism reliability, etc.) and weather sealing. (I'll post a poll on this to mine where this group stands, just for fun.)
Question for this thread is: would Canon ever go all 'mirrorless external viewfinder/grip/etc.' on this problem and make the LCD a kit-like selection of standard / touch / touch+swivel or (gasp) something users could interchange themselves?