Sometimes you want to talk about “A1 vs A2” and sometimes you want to talk about “A vs Z”.
Maybe the distinction between A1 and A2 is rarely made, and most people just perceive them both as a general A, but today you want to talk exactly about those differences, so you need to make the difference clear by putting unusually large emphasis on the differing details. (Maybe the language doesn’t even have three different words for A, A1, A2; sometimes there is just one word for both A and A1, and people would say e.g. “A in the wider/narrower sense of the word”.)
But the next day you want to talk about differences between A and Z in general, and anyone who focuses on differences between A1 and A2 is losing the larger picture… well, unless those differences between A1 and A2 are actually relevant for the “A vs Z” debate you are trying to have; but in such case, the person insisting on the difference should explain how specifically it is relevant.
Essentially, greater precision comes with greater costs, so the person who increases the cost should communicate the cost-benefit analysis to their partners in the debate. Sometimes the extra cost benefits everyone by helping them reach better conclusions. Sometimes the extra cost only benefits the speaker by allowing them signal greater sophistication. Sometimes the speaker is not even aware that these two cases are different (i.e. they may be merely signalling, but it’s not an intentional defection, only just blindly copying what they saw other people do in similar situations). Sometimes the speaker is too mindkilled about “A1 vs A2”, e.g. because it has huge political connotations for them, so they are emotionally opposed to using “A” as an umbrella term for both.
Sometimes you want to talk about “A1 vs A2” and sometimes you want to talk about “A vs Z”.
Maybe the distinction between A1 and A2 is rarely made, and most people just perceive them both as a general A, but today you want to talk exactly about those differences, so you need to make the difference clear by putting unusually large emphasis on the differing details. (Maybe the language doesn’t even have three different words for A, A1, A2; sometimes there is just one word for both A and A1, and people would say e.g. “A in the wider/narrower sense of the word”.)
But the next day you want to talk about differences between A and Z in general, and anyone who focuses on differences between A1 and A2 is losing the larger picture… well, unless those differences between A1 and A2 are actually relevant for the “A vs Z” debate you are trying to have; but in such case, the person insisting on the difference should explain how specifically it is relevant.
Essentially, greater precision comes with greater costs, so the person who increases the cost should communicate the cost-benefit analysis to their partners in the debate. Sometimes the extra cost benefits everyone by helping them reach better conclusions. Sometimes the extra cost only benefits the speaker by allowing them signal greater sophistication. Sometimes the speaker is not even aware that these two cases are different (i.e. they may be merely signalling, but it’s not an intentional defection, only just blindly copying what they saw other people do in similar situations). Sometimes the speaker is too mindkilled about “A1 vs A2”, e.g. because it has huge political connotations for them, so they are emotionally opposed to using “A” as an umbrella term for both.