Some offices (not necessarily just banks) still want people to send documents by fax.

I mean in fairness most people in America use credit/debit cards or echecks for day-to-day transactions. Paper checks are mostly for when corporations or slow-moving bureaucratic arms of the government want to sit on your money for as long as possible.

I've often found it's sometimes cheaper to pay some bills by check. The cost of a postage stamp can be lower than the "convenience fee" of paying online.