My biggest problem with Advent of Code is that the largest amount of difficulty comes from parsing their irregular inputs.

This is why most systems have regular inputs with quality parsers now. I have plenty of shit to say about JSON but it's not

467..114..
...*......
..35..633.
......#...
617*......
.....+.58.
..592.....
......755.
...$.*....
.664.598..

Like... seriously... this is the input for a problem of "collect the right numbers and add them up", which is basically what the past two days were, the increasing difficulty is the dumbness of the inputs.