For example, on bitcoin.stackexchange.com and android.stackexchange.com and stackoverflow.com I have different reputation scores. This is very frustrating because I have no interest in wasting hours on several different websites just to perform the simplest of tasks.
Correct me if I am wrong, but "meta.stackexchange.com" seems to be where I should ask questions about stackexchange sites in general, right?
Before asking I first checked and found here an outline about how reputation works, but it didn't say anything about the different sites and I couldn't comment to ask for clarification there. I also checked similar questions such as this one which did say that reputation is not shared between Meta and Stack Overflow, but seemed to say that other Stack Exchange sites share reputation which simply does not happen and I can't find any explanation as to why. Even the help center isn't clear on this. On this page it explains how reputation is earned, but doesn't explain why every topic category needs its own reputation system.
Honestly, I could care less about reputation. It makes no difference to me. All I want to be able to do is ask questions, get answers, up or down vote, and comment as needed. IMHO, if a person can be trusted to do these simple tasks on one subdomain they should be allowed to do the same on all subdomains. A person doesn't need reputation in the thousands. A person only needs to prove that they are a real and rational person.