OK so it's not an issue with TCG's, it's with Wizard making short-sighted promises. Gotcha.
Not really, at least I disagree. At the time, this decision arguably saved Magic. Their primary goal was creating a collectible that wasn't a fad and kept making them money
f o r e v e r. The game was an avenue to generate continual interest in collecting the cardboard. The game being good, collecting being good and the secondary market being strong are the reasons it's still on top. People complain about investment, but the secondary market and investors are the reason every card ever made is stockpiled and readily available wherever you are. It's also the reason why buying magic staples is generally fine even when expensive; they're easy to resell and you might even make a little in the long run.
MTG has an extremely strong finance/secondary market, they knocked their initial goal out of the park and tbh i think most people involved have benefited overall. They're not perfect by any means, but this decision was the beginning of that faith in Magic as a collectible. I also think most people agree it's better for the game that the reserved list is more or less inaccessible to the majority of players. Even dual lands. It's a fine flex to own them, but there's no requirement to own them, and having them inaccessible bypasses a massive problem with them in that they are far and away the best duals, promoting too little downside in greedy manabases and so little else would be used if they were legal. It's also more and more common to have unofficial proxy leagues for the formats that use them (Legacy and Vintage).