I love the new hud, but on some trains like the Allegra, you cant see the button that lights up, before the alarm. So a yellow dot like in the normal hud, is a nice help for us who like the new hud. Then we can know when to push aknowlede/SIFA. Ive seen it on a train maybe on blackpool. Si it can be done
In my case, I am using Sifa and PZB, then I prefers to use the standard = the original HUD one, as it shows me about those systems. Sifa apart from the fist stage light only, you later have the sound. But the light normally you do not see it. I said "normally", due to most trains have a light for SIFA on the desk, but most of them are very small, and you do not notice it. Despite of that, the good thing is to have different HUD visuals, which adapts for each player "taste".