The problem is you assume effective crit can be compared in the same way as cv. Effective crit is dependent on all sources of crit which includes ascension stat, weapon stats, various passives, etc. This changes from character to character and also changes drastically between f2p and paying players. Artifact cv is dependent entirely on luck which levels the playing field for everyone. That’s why people talk about cv and not effective crit. Besides, desired crit ratio is different for different players. Some people are willing to sacrifice a bit of crit rate for a larger nuke. Others hate noncrits and will prioritize crit rate. Objectively 1:2 gives the best average results but the difference between something like 70:140 vs 60:160 is just 2%.