I dont know when, how, or who conceived the notion that this is acceptable behaviour. Ketchup and fries is a sacred meal time experience and if you’re pouring ketchup over the fries you’re a disgrace to humanity.
With the drizzle method you end up with too much ketchup on top and not enough ketchup to compliment the fries at the bottom. You may think its okay to just reapply ketchup after you eat through the first layer but then you’re just using more ketchup than necessary.
Dipping is the way it was meant to be because you not only can you control the amount of ketchup you have on each fry but also how it is applied.
Par example, you can simply dip and get a good sized glob on the end or you can smear and have a conservative but evenly applied amount of ketchup.
Pouring ketchup over fries is downright inhumane and needs to stop.