It started with the test cricket so it obvious to revolve everything around it, old guard is still romantise the format and in layman terms it's considered real cricket, which comes with lots of respect that's why you see major players wants to play it.
And primary goal of anyone who play professional cricket is they want to represent their nation in whites, it may look boring for someone who grew up watching IPL and T20 games but it's definitely got the same potential in terms of thrilling and we get to kill 5 days of time too.

And shining in the test format is not possible for everyone, they need to be technically sound and good fitness and years of patience so it definitely got it's viewers no matter how much shorter format games we can have. And if someone is performing in test they will be considered the best player too but in T20 most people do and their value just remains for short term.