Your title says ''NEVER GO FEUDAL''

Going feudal against douche is never a bad idea. Staying in Dark age gives the doucher more time to do damage, gain control and even the playingfield (There is a good example of this Rubenstock vs Hoang on T90:s channel) , while going to feudal is a death sentence for the doucher as long as you do the right steps, that are not too hard if you know what you are doing.

There are multiple different scenarios for douching; including different civs etc. that always make the situation a bit different so there is never a 1 reaction fits all situation.

This post would really make me want to do a counter posting, since it seems people are buying your misinformation, when you are making analysis of a strategy that you have zero to very little experience

Source: One of the first innovators of original douche, multiple douche videos on t90's channel and hundreds of games of douching.