Federal developed the EFMJ ammo years before Hornady's Critical Defense jumped on the band wagon. I've been carrying EFMJ in my .45's for over 10 years. The reason they were developed was because hollow point bullets often fail when they become clogged with clothing or other material. I have personally seen hollow point bullets, including the super-duper Law Enforcement Only stuff and HydraShok, clog and perform exactly as a FMJ bullet, with NO expansion what-so-ever. I'm one of the guys who had to recover the bullets at autopsies or emergency operating rooms.
For decades, ammo makers told us we should only use hollow-point bullets, and the bigger the HP the sexier the ammo. I've seen gun guys comparing bullets to see which one had the biggest HP cavities. Once that mind-set took hold, any other options were unthinkable. Then people like me started to point out the flaws in the HP designs and the ammo makers responded with new technology. For some reason gun owners and shooters are slow to adopt change, but cling to the old wife's tales and myths about bullet performance. I was around when the in-crowd resisted hollow point technology, clinging to the idea that soft lead bullets were superior.
Some are upset if the new bullets won't penetrate four (4) layers of wall material and then penetrate ballistic jello. Think about that. Should you really be shooting at someone two rooms away?
Time and technology marches on.
My opinion based on experience. Your mileage may vary.