You misread, and I am very well aware of the changes for the M4 types of systems. I only cited above one example out of many issues.
For the cited example above, "Would you prefer the 30 round magazine with the traditional black follower for an M4?" It worked well enough for the M16/M16A1, what changed to make that a priority? Or look at why we have M4 feed ramps to begin with? The transition of a round from the magazine to the chamber is a more bumpy ride with the M4 ramps. "Why would we choose M4 feed ramps then?"
There are many more examples to look at beyond what was posted, that was just one issue.
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