I think you need to be somewhat less angry and more understanding. I'm always willing to stick it to companies who are screwing the consumer, but to be completely honest - given how old this game was, and the fact that d3t ported one of the two games from the Dreamcast, and the vast majority of the bugs are minor, and not game-breaking.
It's easy to just jump up and say SEGA has wronged you, but I would daresay you've not experienced any game-breaking bugs, and you're just annoyed that there *are* bugs, which is somewhat naive. I mean, the game at the time of being ported over was over 10 years old, written in all kinds of old tech, and I am amazed that given all that we've got a HD remaster that largely plays the same as the DC, with minor bugs.
Now consider this, d3t has under 50 employees (
https://www.crunchbase.com/organization/d3t-ltd#section-overview) - and a number of those are administrative or managerial, so, we're probably talking about a team of less than 20 developers. Now consider this, on the original game there were way more than 50 people who *alone* debugged the game, and maybe a little more who developed it (
https://segaretro.org/Shenmue#Production_credits).
I'm not saying you don't have a right to frustration, but I would say perhaps blow your wad on other more deserving frustrations (i.e. The constant delays of Shenmue 3 and scope creep therein) and not on something that, considering what I just put above, is a bloody good job.
If you're reading d3t, good job! Hope you pay your workers fairly ;-)