On all counts.
First, and most obviously, my relationships with women both short and long term. On the short term, I was able to not waste my time while being honest with them about what my intentions were. Often, they would hope for more or try to get me to commit to more and yes, in moments of weakness might have lead them on to believe there was more, but ultimately would go back to telling them that I couldn't be in a relationship with them exclusively.
The things I learned with these short term 'situationships', 'flings', "ONS' or whatever you like, were invaluable to understanding women's behavior that I never would have learned the 'korrect' way (LTR/Dryspell after LTR/Dryspell). I also learned three important things. 1.) How to balance what I need and desire for myself and what I'm willing and not willing to compromise on and to set/enforce boundaries. 2.) The difference in how women treat you before and after you have sex with them. There IS a difference. 3.) How differently a woman treats you after you demonstrate any milestone of commitment. "We're exclusive", cohabitation or marriage. Also a difference. Anyone who denies/ignores this is a fool or will soon be made one.
People in general? Oh man, it improves greatly. You no longer waste so much time trying to "figure it all out" due to good habits as well as developing both a positive and magnetic personality. The time/money you would have spent experimenting with wardrobe, style, venues, flirting with different classes and lifestyles of women, apps, education, etc is all better spent on things that further your own life and goals. If a woman is on board with how you do that and she sticks around, great! LTR! If you don't want one? GREAT! Keep a rolodex or black book. But you're no longer exhaustively maximizing your efforts for mediocre or subpar pu$$y.
You have more fun and enjoyment in activities, ideally with your LTR. My current lady (She's about to earn a ring!) has over 5k miles on the back of my bike in only 1.5 years, I've taught her how to play chess, shoot billiards and firearms (She responsibly carries!), and as a result others take notice of the healthy relationship and lifestyle. Based off of the things she says to others about me in public or how she presents herself makes me look even better to people who already held me in high esteem or people I never thought noticed one way or another see me differently too. Is it perfect? Hell no. There are times when I tell her "Hey, I want to be left alone." And what does she do? Doesn't start an argument.
Also professionally. If you aren't constantly vying for that 'missing piece that just isn't there' you'd be surprised just how much effort you'd been putting into trying to become a DJ at the cost of a lot of other things. You may find yourself out earning all of your peers, suddenly realizing no one is truly better or worse than you, you're just willing to do the things no one else wants to do. Too many want the quick fix or easy out. The sooner we realize that there isn't one the sooner we find ourselves in a place where our admirers or detractors think that we've found a quick fix or easy out.
I wish more people understood on the back end where hindsight is 20/20 that all of this "t0xic cr@p" is anything but. It's not about being someone who you're not, "faking it until you make it", or being a 'jerk' etc. It's all about learning and growing into becoming better.
