Starting with that absurd first paragraph offering proof for the otherwise inconceivable idea that there are are indeed topics that you aren't qualified to comment on - on one hand, and on the other insinuating that you surely must be more qualified than me to comment on semantics; continuing with the second, totally uncalled for given that I prefaced my comment with "to my ears", yet you didn't; the third, again redundant since I already mentioned that "received" is more general than "understood", so of course the meaning is different - that's the whole point, using a tool to find more fitting meanings, if they would be the same what would be the point?? The assumption is whoever uses the tool keeps the one they feel comes closer to what they had in mind, discarding the rest, no?
Let's stick to this particular example. Why is "understood" a better fit in that context (beyond the original comment suggesting it was closer to their intended meaning)? Because that's as much as we can hope for - to convey the desired understanding. (And yes, that includes connotations and the like, at least if you want to stick to a reasonable, not tendentiously restricted understanding of the word.) How the meaning is received depends indeed on other context, like maturity and generally life experience. For example, you were probably hoping that your message would be received with awe and newfound respect on my part for your wit and depth of insight. But instead, I found you comment merely tedious and vacuous. Consequently, I don't plan to check back on whatever you might scribble in response.