The daihatsu charade wiring is not that much - I consider it to be underwired infact, it shared many wires with something else.
The underdash mess - is usually because of some inexperienced person installing a remote door lock system or something else, They break away the wiring loom locking clips and sometimes the sheathing which results in them hanging loose.
Proper sheathing, cable ties, mounting clips and eyelets make it neat and reliable, If someone is telling you "sharaad ke wiring ka masla rehta hai" move on he has no clue about the basics of wiring.
btw - If you want to see a wiring jungle - Mercedes W140 it has unsheathed exposed wiring and by the hundreds - I believe the electrician commenting on the "sharaad wiring" would faint or commit suicide just by looking at it