Why isn't there so much talk about the war crime that people can have in their build Randuin and Tabis?

I know that the fact that crit ADCs have no real options to deal with HP stacking is one of our biggest problems when it comes to killing tanks, which is supposed to be our job, but isn't the fact that anyone can build Randuin and Tabis at the same time another problem as serious or even more serious? Critical hits with Infinity Edge only do 116% of the damage of a non-critical hit if you build both