All good points. But there is a downside to carrying an all-chain primary rode. Add that weight to the 40 to 60 pounds of anchor hanging on the bow, plus the requisite electric windlass, and the total becomes nearly 700 pounds. Multihull sailors are acutely aware of this weight. The weight can, in fact, change the sailing characteristics and seakeeping abilities of a boat, promoting pitching in a seaway, nose-diving in heavy running conditions, and a mushy feel on the helm.
Chain is dirtier than nylon.
Anchor in a muddy bay or river, and next morning a chain rode will be clogged with ooze that needs to be hosed and brushed off to keep it from festering in the chain locker. Anchor for a long period in one place in the tropics, and the chain in the water will become an undersea marine garden, complete with its own blossoming ecosystem. It takes a wire brush to clean it. Use a length of chain for long periods in coral or rocky anchorages, and the links will begin to rust, leaving the anchor locker and everything that comes into contact with the rode stained the color of burnt ocre. If chain is the conventional choice, then, it is so despite its drawbacks.