I have a bit of a paranoia in missing flights... Since LH removed the wardrobe with storing space I tend to board as early as possible - especially if you sit in the first rows. Better wait a few minutes at the gate than get no space for your luggage or miss the plane.

For a delay I tend to have multiple sources of information:
- The LH App shows the current state of the inbound flight. If it is not there, no need to wait at the gate.
- Some lounges - especially at smaller airports have aporon view - so you easily can see if your plane arrived.
- I sometimes ask the agents at the lounge if they have any current information
- Flightradar shows the position of your plane.
- Of course the official boards.

When the plane has landed I slowly move to the gate. I have seen incoming flights with only a handful of passengers or packed full planes. So deboarding can take very long or can be over very fast. So mostly I will arrive when deboarding is finished and it then takes only a few minutes before the boarding starts. When the Flight is delayed I did spend enough time in the lounge, so a short and slow walk is a good way in passing a bit of time.

I did many flights in my life. I only missed a flight once, where the Autobahn was blocked for 4 hours by a truck accident. Better save than sorry.