Better contrast (maybe black outline) on keyframes or darker the highlight background vertical strip in timeline (on Timeline Indicator) in Dark Theme.

I think in (very) old versions I havent these readable problems (I using high quality monitor for years).
Just do more readable keyframes in Dark Mode. Or add contrast, when Accesible color contrast is active.
Or enable to remove the vertical line behind indicator.

Actual state (I see just gray vertical line):