Of course it's them being cheap. But if it's the difference between them releasing the game outside Japan or not, "we can't do it" and "we could do it but will make more money doing it this way and won't bother otherwise" is irrelevant.
Evidence is everything in court and we simply need to compare Investigations 2 and Ace Attorney 5.
Investigations 2 isn't a mainline title. I don't think it's a fair comparison.
But rather than go through this song and dance again, I'll just say that I will be incredibly disappointed with Capcom if they decide to continue this second-tier digital only designation of Ace Attorney titles. Hell, even Level5 has the decency to release a physical version of AA vs. Professor Layton. If they release AA6 digital only, I'll buy it because I have no other choice if I want to play it. If they release AA6 physically, I'd probably buy 5+ copies for friends.
But then again, it's been a long time since I haven't' been disappointed by Capcom, so I suppose it's pretty standard.