Agreed. It really sucks for the Vita games that are having issues. Vita cart production has ended, so there's nothing other than patches that can remedy the issues. What's the point of preserving a game if it has crippling bugs that don't allow the user to finish it? Also, releasing physical games that require updates to be downloaded goes against the whole idea of preserving games in physical form for a time in which servers that house the games and updates are closed down. When it comes to Game Tengoku, it's plain and simple false advertising for LRG to say that the purchase price includes specified DLC on disc, then leave some of it off. Consumers paid for something that was promised, but didn't receive it. Offering the DLC as a download in the future is not a good resolution at all. If indeed the Homura ship was left off the disc then LRG needs to make things right by making sure each customer receives a disc that includes what was promised.
Given the collectible nature of LRG's games combined with the small print runs, I am assuming many of the releases do not get played by a large number of people. I wonder if there are undiscovered glitches in other games.
I agree on all counts, a big part of why I buy these physical releases of games I enjoy is the preservationist mindset (and that's also something LRG likes to tout as well). It bums me out when I pop in one of these titles and see patches still getting pulled down, or hear about issues with other games people have purchased.
Your last point is something I was thinking about last night as well...I'm curious how many issues like this might not be noticed until a while down the road. I know I'm personally guilty of buying these titles and not opening them in the case where I already have a digital copy and I'm double-dipping on a physical (which is probably like half the time). Game Tengoku I didn't own digitally and I was excited to check it out, which is why I came across the issue. I've bought a decent amount of stuff from LRG, and this is the first time I feel actively cheated, like you said, it feels like false advertising in this case.
I triple checked regarding the Homura ship, to make sure I wasn't going crazy, but there is a very specific menu option in the game where you can see what DLC is available, and it definitely shows Homura as locked (the character even does a little monologue to convince you to buy it), and when you go to play arcade mode, it's not selectable. The Clarice DLC ship is available though, as well as being able to activate the voice pack DLC, so 2 of the 3 DLCs are there.