I've put several hours into a couple opt in 1.3 r2 games. While my playstyle has to change dramatically (for the more interesting), one thing I continually find myself wishing I could do is devote my research in an 80/20 type split towards two different techs, an important one that's a goal I want & a quality of life one that I would simply like.
The second one is to not have social manufacturing go to null when I rush buy something, reduced maybe, but not null., the current state means that the first few turns should always be rush buy stuff while at 100% research since it doesn't null output, even though some planets on large map sizes would work better with other alternatives