What's the difference between GT Mode and career mode exactly?
Long-winded, whining post warning!
I'm sure many will disagree, but here's how I see it.
GT Mode as it stands (ignoring GT6) has always been a series of one-off races, like the special events. Save up enough money, buy a car, enter the race, win a car. Rinse and repeat until you beat them all. The focus is more on car collection, hence grinding to gain money.
Career mode would be more like the recent F1 games by Codemasters.
Difficulty settings, qualifying, flags, standing starts, different teams, etc. Based on your results, you can potentially race for different teams and upgrade the car. Do that for 7 years and see how many times you win the title.
A career mode has a sense of progression. Starting from the bottom and working your way up, seeing more and more opportunities present themselves, depending on how you race. Opportunities that aren't the same every time and can vary depending on how fast or how well you race. This gives a purpose to restarting your "career" if you want to make different choices, try different teams, try different racing series, etc. This is the same way you might pick a different route, or try different weapons, etc when you replay through an RPG or adventure game. GT mode vaguely has these qualities, such as having to get gold to win a prize car, but there's not much more than that.
It might be subtle, but there's definitely a difference. If you read the "what do you want in the next GT game" thread, you'll see tons of great ideas that better highlight the differences between the two modes.
Think about this: they had the licenses for Super GT, NASCAR, and DTM. All of those could be a career mode in and of themselves, almost like 3 separate games in one. But they were really just used as names for races and one fairly brief Special Event. There's a bit more to Super GT than just getting gold in three races.
They could even split the two modes apart to make everyone happy: have an in-depth career mode and keep GT Mode as it stands.
Think about the common question lately on here of "should you be able to import all your cars from GT5 to GT6?" If GT has a true career mode, you wouldn't want to do this. Starting from the bottom and working up is the game itself, so you wouldn't want to shortcut that aspect. But since GT mode for the past 15 years is mostly just grinding to win money, naturally it makes sense that many would want to skip all that and just race. Even more now that online-play exists. The game design hampers how people want to use the game. Arcade mode was pretty limiting and didn't give you access to all the cars. Imagine a Madden game where you couldn't use all of the regular 32 teams right away in exhibition mode, 2 player, or online, and you were forced to play through franchise mode to "unlock" all the teams just to use them in the other modes. It's an understandable frustration.
I'll go back into my cave now.