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No they're not, where did you get this idea?
If you were right, they would be a reliable indicator. But in fact they're not because any dev can choose to release their alpha with just an intro as "1.0". There's no way to enforce that made up rule of "1.0 is a complete game". Therefore it's not an actual rule, it's just a misconception.
It's only wrong because you're wrong about version numbers. If you didn't assume that "1.0" means "complete", then it would be fine to release an alpha as "1.0".
And there you go: everyone has their own rule about version numbers. You prove my point while trying to say I'm wrong.
Maybe if you looked a little bit deeper you would see that version numbering varies wildly:
- Some people use the simple "0.1, 0.2 ... 1.0" (which you think is how version numbers work)
- And then you have the guys who start at 1, then 2, then 3 ...
- And then it gets more complicated, which is difficult to grasp for simpletons: "20.04" = year.month, which is the rule that Ubuntu (Linux) follows
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- Oh but we're not done yet : 3.14 followed by 3.141 followed by 3.1415 followed by 3.14159 ... which is the rule that TeX uses
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- And lastly for my professional project, at work we use 4.0.4.15, 4.0.4.16, 5.0.5.1 ... because we combine 2 version numbers for releases
Sure it would be a wonderful pink rosy world with love and friendship if everyone instinctively followed the same rule, but it's not. We have freedom, we can pick whatever rule we want or make up our own. Therefore it's stupid to assume "1.0" is "complete" or that "0.0.01.a.1.a" has very little content.
Here's a tip when trying to evaluate a game : look at the rating, look at the tags, look at the reviews, look at the changelog, look at the comments on the thread. They are reliable indicators of whether a game has content. The version number is NOT a reliable indicator.