Maybe you don't use it very often? For months before the recent chaos it was very reliable. The fact that it's working today is only because I fixed it, Twitter didn't change anything.
Timelines are usually blank, to the point that I have removed it from the rotation of instances in my browser redirector extension. I assumed this was a result of being rate limited by Twitter.
I will admit that since I did remove it from the rotation, I don't see it that often these days, mostly when others link to it and then I navigate to a timeline.
I’ve had timelines/tweets fail to load, but a refresh fixed it quickly. If this was a consistent problem did you consider opening an issue to see if they could improve the website?
I quit twitter when I discovered it. Thank you.