This change is as unneccessary as it can get. As long as I do not see an inherent need to change that (other than Ephemeral just disliking it?) or as long as someone is unable to reason out why the current usage of "subjective", "objective" and "intersubjective" is not conform with what these terms are universally defined as (and all three are clearly defined scientific measurement types), I assume that the current usage follows proper terminology. I am yet to see examples where the current usage is faulty or misleading or confusing.
A "shared opinion" is not conveying the level of "near-objectivity" that the term "intersubjective" inherits and is defined as. Intersubjective facts are still facts. They are only based on a consensus amongst close-to-everyone instead of mathematical logic and measurement (e.g. 1+1 = 2). An example for intersubjectivity is basically any law book (as morality and what is right or wrong is ultimatively subjective, however, whole societies have agreed upon a consensus to follow and wrote laws for it. A drastic example would be that nobody likes to see random people be killed, so we all just agreed on forbidding it eventually)
In that conclusion, actually majority of the Ranking Criteria is somewhat like a law book. Therefore, the Ranking Criteria is in it's very core intersubjective. And in the modding and mapping world, there are many "unwritten laws" that people follow. Things that you can not shape into a black-or-white Ranking Criteria rule and sometimes are only reflected in guidelines (if even). Intersubjective issues are those issues that break said "unwritten laws" that nobody ever bothered to put into words in shape of a rule (which would require said black-or-white assessment) or a guideline.
I would also favour people being able to actually write down said "unwritten laws", but we all know that as soon as we write it down, we fail to pay attention to context (such as not all of these unwritten laws apply equally to every map, as every map is different and in some cases, it works and it some it does not). In it's very core, all of these things *are* subjective, but they are so much universally agreed upon that they simply turned into law.
Removing the term "intersubjective issues" with "shared opinion" devalues the nature of issues that indeed try to address violations of said "unwritten laws", as "shared opinion" would only mean that "many people think it's bad", which is not really the same as "unwritten laws".
A very prominent and recent example for an intersubjective issue would be the taiko map "My Movie". There is no rule that forbids it. There is no guideline that prevents it. But there is an "unwritten law" that this shouldn't be done.
"This issue violates standards of community consensus" is quite a mouthful and "intersubjective issue" directly conveys what is meant.