The first simple rockets saw it challenging to land on certain planets without building a huge rocket or using the ion engines. Many people want to explore without worrying about running out of fuel or losing battery too quickly. That's why I think there should be a cheat menu so we can do stuff like:
1) Infinite fuel
2) Infinite electricity
3) Infinite monopropellant
4) Set orbit
5) No heat limit (if there are deadly reentry effects)
6) Hack gravity
All of these could be disabled in missions and optional in campaign (if there is one)