I would also like to stir the pot a bit.
The real question here is not weapons systems per se but how they are allocated and used.
The original post noted that section-level, and implied hat even pl-level leadership is beomcing confined to being a mere node for a larger attack ordered by an OC cmding a coy. This, to some extent, is true. The so-called RMA has allowed for an increasing level in comms systems that allow a commander at a higher level to "grip" the battle more effectively.
The problem here is that even the fastest communications technology can replace lateral co-ordination by two section commanders, facilitated by the pl commander providing assets when needed (ex/ 1 section secures fold to protect 2 section's flank in operation vs MG posn. Pl comd orders wpns det to use 60 mm to isolate 2 sect's target and is there to reinforce 2 sect w/ 3 sect if necc.)
At this point, it doesn't really matter so much if you have a 51mm, 60mm or CASW. What matters is the freedom of action afforded the pl cmdr.
But can you blame the OC? What else does he have to do? The assets that should be consuming his time - co-ordinating low-level eng (ie, pioneer) support an bn-level AA/indirect capabilities to work within his plan is now out the window, as the 81mm and pioneers are gone; attached arty and eng assets are now routed through bde, out of the OC's immediate CoC. So he now has to work very tightly with the platoons to make the plan work.
New weapons systems really ought to empower the Coy-level to provide support to platoons, which would probably result in a lessening of micromanagement - there would be no time for it. I would propose that the CASWs be concentrated at the coy, or perhaps even bn level, to give extra support to the main effort when needed and allow the OC and CO to do their original intended jobs, much like how the HMG was concentrated as a support arm in the First World War.
And, yes, I'll say it. Let's get the pioneers back.