In other words, you don't want to be held responsible for your words. I'm disappointed in you. You should give others the courtesy of knowing who they disagree with.
Let's go completely toward your direction and say every single person here used a fake name or none at all. You have no idea if the person you are reading is Messi, Auktuma, a 2-day old player, or that guy that cheats every chance they can get. Of course no one would post screen shots or describe their inagmes too closely for fear of revealing themselves.
Would this please you?
I think it's more accurate to characterize this as "overshooting" in my direction. You are quite right that mandatory anonymity would be silly. It would also be unnecessary, as the anonymity set is large enough to work well under the current policy. You could think of my stance that identity disclosure should remain voluntary as a synthesis or middle ground between the topic proposal and your scenario.
I also believe conflating anonymity with cowardice fails to responsibly portray the real pros and cons of identity disclosure, both at individual and collective levels. Many others have listed the pros, while my prior post includes some example cons. In general, the set of questions, comments, opinions, etc. people will and rationally should share given anonymity is a superset of what will and should be shared given identity disclosure. Clearly it is better for the individual to be given the freedom to make the best of the disclosure/anonymity tradeoff, but unless we're supposed to believe that nothing outside the disclosure set but in the anonymity superset is valuable to the community, we should at least be open to the possibility that allowing anonymity is also better collectively.
In addition, there are many instances where the absence of identifying information itself is of intrinsic individual and collective value. Consider the use of blind auditions as a tool to eliminate systemic gender bias. In general terms, we want others to judge our performances/ideas/arguments/etc. on their own merit, independent of what they think of us as persons, and we
should want to do the same for others, but we are notoriously bad at actually doing the latter. Perhaps this tendency has even subtly crept into your post, where it expresses disappointment in
me on the basis that
I don't want to be held responsible for
my words. In reality, all I've done is express an opinion regarding the freedoms of others; I have personally waived this freedom by voluntarily linking my in-game and forum identities for over a decade. Either way, I think it's fairly obvious that anonymity can be a great aid, perhaps the best aid, in overcoming these types of tendencies.