Since I haven’t seen anyone post this, I thought I’d share the new Star Engine demo video from Cloud Imperium Games.
Usually yes if you use only numbers, but when you use alpha/beta/release cycles etc, it’s not that uncommon to have them start from 1.0 as well.
As an example, the fifth phase of minecraft dev started with “Minecraft Alpha v1.0.0” and once it got to v1.2.6, the next was “Minecraft Beta v1.0.0”. The proper Minecraft 1.0 came after Beta 1.8.1.