I have several buddies in USMC, and their "USMC Shooting Team" does indeed focus on the basics of "their" service rifle for their Corps matches and the Nationals at Perry. Round bullseyes, jackets, slings, single loading long 80 grain cartridges that won't fit in the mag, etc. etc.
When put into the "combat" matches of AFSAM, however (similar to CFSAC at the time, but a bit more hectic in terms of the pace and rounds fired...)-- they did remarkably well, in 1996 at least. As a matter of fact they were the only team that was even close enough to Canada that year to be a contender. I would suggest that the basics are like walking. And if you are good at them, running is simply "walking quickly." That year the US Army teams and other foreign teams seemed to be focusing on a training principle called "running before you can walk" and were met with failure all around. I'm pretty sure that our "Ranger" representative, with his Lee Enfield, shot a higher score than the average German soldier that year. Scary.
USMC taught me this saying: "Get GOOD, because good is SMOOTH. And smooth is FAST"
You can't do it the other way around.
Some will say that modern armies can't dedicate the amount of time required to hammer the basics like this. Other pressing tasks competing for time and resources. 100 percent true. Welcome to the "grey area." If you are a competitive shooter only - perhaps hammering at the basics is a good strategy.
Iron sights aren't that bad. They don't shift zeros as much as a bad optic. But on the other hand - I gotta admit that my worst days with Elcan were still better than "most" days with the old iron sights.