A basic premise in the military is: "If its new it won't work."
I can remember, at Hohenfels, the TCs wouldn't use the new fangled radar on their M-60 tanks. They said that the "flash to bang" means of range determination was superior. Until --- a unit took their ATT on a foggy day with very limited visibility. They had to use the radar and maxed the course.
When Jeeps were introduced we all complained that they would never work. What would happen if you ran out of gas. All you had to feed a mule was some oats, or just some grass in an emergengy.
Of course, on the other side of the coin, this being a capitalistic society, arms R&D and production means big bucks and jobs.
Never having been other than SF, I would still think that being able to fight from within the vehicle would be a plus. IIRC the M-113 is merely a means of transportation. I also hear the M-114 mentioned. IIRC that was a mobile command post.