Capital/lowercase are a way of *showing* distinctions in language/grammar. i is a letter, I is a word. ‘a mom’ is different from Mom. We use capital letters (in English) to distinguish proper nouns (England, France vs. apple and butthole) as well as the starts of sentences. Other languages can use capital letters differently. My whole point being that capital letters *have a meaning*, they aren’t random, they convey an additional piece of information.
Numbers simply don’t have a similar need. It’s not like having 1 apple vs 1 Europe needs to be conveyed in number writing. **HOWEVER** we do run into something similar in Math and Physics… but it’s complicated. For example, distinguishing between a scalar and vector values or signifying between real and imaginary numbers. There are established standards and traditions in writing these types of numbers that *you absolutely could compare to being upper / lower case numbers.* They are just kind of exotic to laypeople so it’s understandable you wouldn’t need them in daily life.
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