Added weight compared to what? If you are looking at the extreme ends of the spectrum like a compact ultralight 3-9 at 12 or 13 oz as opposed to the 2.15-15 or 4-20 at 25-30 ounces, yea, it's a big difference. When you look at high end scopes, there's almost no different in weight between FFP and SFP at similar magnification ranges.
SFP scopes like the Nightforce SHV 3-10 is 22 oz, Vortex Viper HD 2-10, is 19.9 oz, Leupold VX5 HD 2-10 is 17.9 oz, Tract Toric 2-10 is 18.6 oz (though the 4 different ones I played with were all in the 22 oz range). FFP SWFA 3-9 is 19.84 oz. There's literally NO weight difference. I toyed with the other three scopes I mentioned, and while they were all excellent to look though, there was just something about each of them that didn't click with me. I just bought 4 of the SWFA 3-9 and they seem to be the ticket for me, even though I'm in the east and not expressly looking for "long range" hunting capability.
The reticle is very visible even at low power. I sat on my deck with the Viper HD and the SWFA, both on low power, until well after legal hunting light, and glass wise, there was no advantage of one of the other. At low power, the center stadia on the Viper were more visible (they're thicker too) than on the SWFA, but again, not enough to fret the difference. I thought that illumination was going to be a game changer, but with my astigmatism, the illumination flares and starbursts, which offsets its usefulness to me. So, I'd rather have a heavier outer reticle than illumination.
9x or 10x is more than enough for any deer/big game hunting out distances that 95% of us shouldn't be shooting at. If you can't kill a deer/bear/elk at 500yds with 9x, it's not the scope that's the problem. I shoot prairie dog sized steel targets at 200 yds + with scopes set on 2x and 3x all the time. I honestly can't fathom why people need 16x, 20x, 25x and more on big game hunting rifles. even if they're routinely killing stuff at 700 yds+. I suspect that more of those folks are using the big scopes on their rifles not just as aiming devices but for the same purposes as binoculars and spotting scopes, though none would ever admit it.