You can't really be too sad about it though. They have some really, really nice mechs these days. Much as it pains me to admit it, the Men Shen is probably the best medium Omni the Inner Sphere ever built, and the Agrotera is also very impressive. If you can build mechs like that, why spend the production resources on the Vindi? In the dark ages, the Cappellan medium mech RAT is full of 5/8 55T mechs, some of the best non-clan 50-tonners in the game, and even some clan tech at the high end. With that sort of competition, it's hard to justify adding new Vindi variants. The Raven II is on there as well, so you would even have competition for the specialized EW role. The again, they decided to make the Gun as a clean-sheet design, so maybe the Liao family isn't done with small, slow mechs just yet!