Agreed, but I think it's deeper: when I was in my 20's I didn't even know what sexual compatibility was. Given that, how could I even have made it a criteria for partner selection?
That assumes people figure out their sexuality. I've seen way too many people that didn't figure it out until their 50's. Like, "heterosexual until later in life" figure it out. And, there's an entire spectrum until that.
I suspect sexual compatibility lowers in importance as people age.
Certainly there are some old couples that stay together without good sex for different reasons, religios beliefs and such...
But if you are an intimate couple - that includes sex. If you are not having sex you are just roomates / friends - and there is nothing wrong with that.
I know a few different people in thier 70's right now having really great sex because they have found new partners, and because it's great they are having a lot of it.
So it could be less important if both people's only goals are stability or other goals - however we are seeing from reports in retirement communities and nursing homes that whether it is the loss of partner through death or divorce or just ageing single into a new community of options - that people are indeed searching for sexual compatibility as they age - often times with many more partners later in life than mid-life.
Saying that this matters less when that, or you'll loose interest in sex as you grow older simply won't fit for a lot of people. But for a lot maybe it will.
But since all of this is such a inherently personal thing, its opinion around the world will be as divided as our own butts.
If you aren't compatible sexually then you are not compatible.
I have been married twice. My first wife was practically my "soul mate", we had the same taste in everything. We were best buds, everything was perfect besides our sex life sucked. It always led to conflict and problems.
My wife now we have almost nothing in common when it comes to taste, art, music, hobbies, nothing. We have an amazing sex life though. I couldn't be happier.
That is not how it works in the movies. I am supposed to meet my first wife and live happily ever after. It is the difference between real life and fiction.