FWIW...
I can see a NF 2DD reticle in a BR just fine. Won some bling using those.
After the first year, I thought "I'll get a CH-3", the whole 'aim-small-miss-small thing.
Worked great on light back grounds. On white paper with an orange target spot @ 600 yds, it was awesome. I was *so* going to kick everyone's behind!
1000yds on an overcast PNW day, on an F-class target... the damned thing just faded out. Crystal clear view of the target, but no crosshair. If I took my eye out of the scope, tried to 'relax', look at something close, don't strain the eye... I could get back in the glass, and see the crosshairs for oh... about 5-10 seconds before they faded out again. Try reading the wind like that. Try shooting for score like that. It doesn't end well, trust me.
Tried adjusting that scope every which way, and spent considerable time on the phone with NF. Finally got rid of the damned thing, and didn't look back.
The 2013 scopes we got from NF for the US team had kind of a weird cross between the CH-3 and the FCR-1. Guess what - couldn't see that worth a dang either.
Later, when NF came out with the new 'DDR-2' in the 2014 version of the 15-55x Comp scopes. A known high-level shooter who *also* liked the 2DD assured me they were the same reticle subtension, so I got that when they upgraded our team scopes to the new style. Nope, BS, not even close. I could see it 'better' than the previous reticle, but not anything like comfortable.
Much later, I got a Vortex Golden Eagle, and dithered over the reticle. I don't particularly like a plain crosshair, I'd rather have a 1/8 moa dot in the middle there but Vortex is a little stingy with the reticle options compared to what NF used to offer. I decided to try the ECR-1... and guess what, same thing. If I was shooting short or mid range, or on white-ish targets, great. Otherwise, a hard pass. Luckily, I was able to find another someone else on the team who had a NIB Vortex GE with the SCR-1 reticle that was willing to trade straight across, in time for me to take it to an upcoming match.
I might not 'like' the plain crosshairs, but I can at least see them.
I don't know if its something about the eye needing something to 'follow' in to the center so it doesn't lose that tiny dot - which is the same subtension as the line, IIRC, just not continuous. In some followup conversations with Ian Klemm about having these issues and others (even with the fine crosshairs, one line would appear more faint than the other, to my eye) he wondered if I had some astigmatism - which I do. My prescription has since been updated, and I can see both lines 'better' - but still not perfect.
Long story short, there *are* people who have issues seeing those tiny-a$$ center dots - they're not for everyone.