With the new version of the game coming up, I feel compelled to chime in about this. I’m sure a lot of people will call me a scrub for this but I don’t really care.
Effectively, plinking gives you one extra frame to input a link by using the input leniency in the game (which was probably designed to allow for easier EX moves). In order to hit 1 frame links consistently it is an extremely useful technique and in many cases is practically required.
Would it cause serious harm to the game to implement an extra 1 frame input buffer for normals that duplicates the functionality of a plink without requiring the extra inputs? Input buffers have been used in many games before, including Killer Instinct, Blazblue, most 3D fighters, and (I think?) Street Fighter X Teken.
I can’t think of any downside.