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It is written very strangely. It's not exactly like they reached the decision to use F-line traps for co-processors, I'm pretty sure F-line traps were designated by Motorola for co-processors, and A-line traps were free for use for OS and Toolbox trap instructions.

The "software crashed expecting a co-processor" part doesn't make any sense either, you were always supposed to check if a co-processor was available. There was no big rug pull or anything, both the first models and some later models simply did not have co-processors. Developers were provided this information.

And the last two sentences seem completely unrelated to the prior ones, so I'm not really sure what they're trying to string together.