Implying that anonymous imageboards are all like 4chan is like implying that the reddit homepage is what you get out of reddit; even assuming that all of 4chan is bad is pretty inconsiderate, boards like /diy/ on 4chan are a gem for those who seek proper information.

There are some brilliant imageboards which moderate themselves, toxic users are weeded out by the community hivemind and only valuable information is kept. No ego-driven moderators to please, no "circle-handholding", no waste of time or energy; basically like good old pre-eternal September internet.