There are a number of companies that have no expertise in SLRs or film based cameras that are coming up with mirror-less cameras, not DLSR.
Only Panasonic has no experience in reflex mirror systems. All others (including Sony because they have bought Minolta) have built film SLRs before they entered the DSLM market.
I might suggest that the prices more due to companies trying to chase after any consumer as the market tanks.
Wrong. The prices I've listed are from 2003 / 2004. From the biggest German camera distributor (which is even always a bit on the expensive side). In that period more film SLRs than DSLRs were sold. So these prices are representative for the film era.
And absolutely and clearly indicate that producing a reflex mirror system is
definitely not expensive, just the opposite.
And if you go the 90ies, 80ies, you will also find lots of entry level SLRs at very low prices.
Also look to what Leica did for their new SL. Viewfinders in the film based SL line were EXCELLENT, yet they choose a EVF over a prism.
And with what result? The Leica SL is extremely expensive, only very rich people can afford it.
The new SL is more than 3x (!!) the price of a new Leica R9 was.
And is the EVF of the SL better than the viewfinder of the R9, an EOS 5 D MkIV, EOS 1 Dx MKii or a Nikon D810 / D5?
No.
By the way: Leica should have continued the excellent R line, with both digital bodies and a film body.
I might suggest your facts don't hold up to even the quickest testing. You do bring up some great points of discussion though.
I have to completely disagree.
The extremely low prices of film SLRs for decades are facts.
And every camera engineer will tell you that reflex mirror systems are
not at all a big technical problem or a big cost factor. They are mainstream, mass market and completely matured technology for decades.
Cheers, Jan