I am nearly 60 and have been married for nearly 40 years. All I can say is that the attitudes towards dating, marriage, and solitude have significantly changed over the decades. I have 2 sons, one married, and my eldest was married and divorced within a year (she had been cheating on him) and it damaged him enough I don't think he will ever get married or even date again. It really messed him up in that regard.
Amongst many young men, marriage and family is often seen as a huge risk to their well-being, a combination of financially, mentally, and emotionally. As a result, commitment is a huge issue, mainly because of the risks involved with it. "Casual relations" is something that has become more acceptable for single people, whereas there used to be rules and a stigma associated with it. Women and men are different these days. A huge topic.
I am glad I am married, because she is nothing like many modern young women these days. She's an "old school" feminist, strong, independent, has a career, makes decent money, and for the most part, doesn't "need" me. I don't "need" her either, but the two of us find that we are better together. We both came from generations of parents and grandparents that never divorced, and as such, both grew up with examples of people who knew how to settle their differences, even if it meant agreeing to disagree, without it leading to destructive results.
At any rate, I agree and like the idea of self-improvement for your sake, not someone else. Granted, it does present as better "bait on the hook" when fishing for a partner. Both men and women would prefer a youthful, healthy appearance in their potential partners.
I also agree that just because you can live in solitude, that sometimes having a life-partner can make life a lot easier. My wife and I compliment each other. I joke that the two of us make one good person.
It seems logical that putting yourself "out there" in public increases the likelihood of meeting people. There's something a lot more personal and emotional about meeting someone face-to-face, getting to know them, and then over time being able to decide if the two of you are compatible or not.
I know some people think the whole dating app scene is more convenient and perhaps gives more opportunities to "weed out" people, but on the other hand, it seems to be a very toxic environment and it is heavily biased against males. Men may struggle for a long time to find a single match, while women are able to receive several matches and be are able to choose. Most men often times, are just happy to receive any attention, while most women often times have a long list of criteria to meet. It's an entirely different situation where many women are competing for the 1% of men out there, leaving the majority of men without a chance to even participate in the process. If you're one of those 1% of men that women are fighting over, well, you might be cast as "a player", able to have relations with several women, and you might not "settle" on anyone, either. Multiple women sharing the same man, but he might just find it fun and exciting and NONE of the women are able to have him exclusively. It doesn't bode well for stable monogamy and long-term relationships.