low recoil,
Lots of guns are, the M1 carbine held that role for a long time.
accutate,
Some were some weren't, flat-top uppers were rare.
high capacity,
Not a selling point for many. Bulk mail-order ammo was illegal from 1968 until 1986.
Not until the early/mid 90's if I correctly remember the magazines from that time I read. About the only thing "modular" was the length of barrel you put on it.modular,
We saw the same thing with AK's in the early/mid-part of the 2000's. The market for things like rails and other accessories for the AK were seriously lacking in quantity and quality. Quality optics or optic mounts for the AK were hard to find. Now that market is far better catered to and an AK can hang virtually any accessory the AR can, and some that the AR can't.
Within the last 5 years we say the same thing for the mini-14. With the new 580 series Mini the accuracy was greatly improved and even older models could keep up with the barrel stabilizers that were introduced. Rail mounting systems are also readily available for the Mini as are a wide variety of stock options.