Why metropolitan marathons should be restricted

We must stop these frequent, low-quality marathon races held in city centers just to please hobbyist runners, while forcing citizens to endure unknown amounts of temporal, economic, and mental sacrifice.
It is not the Boston Marathon, nor is it a national event; why can't they be held in the outskirts where the roads are well-maintained and traffic is light?
I remember it from the mid-90s.
On my way home after visiting my father's grave in Banghak-dong, a trip that should have taken 20 to 30 minutes took two and a half hours.
The traffic started jamming from Suyu-dong, and by the time I reached Mia Junction, I was completely stuck.
Apparently, it was some "Korea University Students' April 19th Marathon."
I still cannot forget the stress I felt back then.