IMHO fiber optic sights are kind of a "middle of the road" option in between irons and RDS, the better qualities of both and my personal preference all things considered......just felt like I "needed" to toss this into the fray (don't hurt me too bad )
Better iron sights is a step in the right direction. I just added TFX Pro sights on my P-01. They're both fiber optic for daytime; with tritium behind the FO for low light conditions at night. Big improvement over factory sights. I'm also trying XS Sights 'Big Dots' on my RAMI. My eye sight ain't what it used to be, so anything that will give me faster acquisition on target in a defensive handgun is a plus.
However, I understand the financial limitations of agencies adopting significantly more expensive sight systems. The TFX Pro sights only cost about $120 so that's probably more realistic.
Having BOTH FO/Tritium Co-witness sights AND a good RDS is my ultimate preference. But that's JMO.