They make those claims because there are more numbers than the one '10' so it is more likely.
However, given a value we know nothing about, in this case aliens, it is impossible to determine.
You are completely right that people should not say it seems too human. That is currently an assumption based from bias.
I watched a televised series on Netflix about "the history of mathematics" or something like that. It explains how math (counting) evolved across civilizations and time.
The concept of ZERO was invented in INDIA. Prior to this (if I'm remembering correctly), Babylonia had a base 60 system. They used both hands to count in the following way: With one hand, the THUMB is used to count knuckles on the other 4 fingers. 3 knuckles per finger, across 4 fingers = 12. On the other hand, each finger and thumb were used as multiplier. This resulted in a system that counted up to 60. 12 * 5 = 60. It was a very GOOD way to count because 60 can be divided in many ways: By 5, 10, 15, 20 and 30. It made a lot of complex math at the time easy. That system is also believed to explain why our time system is based on 60 (60 seconds in a minute, 60 minutes in an hour). The Babylonian method of counting died out because they didn't have the concept of zero or negative (how much do you owe me?), ortherwise today we would probably have 59 unique numbers + zero.
Egyptians had a counting system based on symbols. Mayans had their own system. Asian civilizations used sticks and are believed to have "conceptualized" the concept of base 10. They just didn't have "zero" in their vocabulary.
Anyway, my point being: Over the evolution of mankind, we have created SEVERAL different ways to count and do math. We have EVOLVED our mathematics and settled on a convention with 9 unique numbers and the concept of zero, resulting in a system called BASE 10.
If humans went through many different systems of counting and settled on this one, why does anyone think an alien civilization would happen on the same convention? Especially if they didn't have 10 digits like we do?
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