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DH is the oldest of three. We are presently pregnant with #3. He would be OK to be done but I am not sure. (To be far he would be fine with just our two boys)His brothers and himself all do fine together but the younger two are closer. I think their closeness has more to do with proximity and interest.
I have always wanted 4 children but it will depend on the rest of this pregnancy and what our future holds.

I think it really depends! I'm the youngest of 3 and always felt left out because my brothers were close in age. While they were 6-7 years older than me. And I was the only girl.
My middle brother has no middle child syndrome whatsoever. He's extremely smart, outgoing, funny and social.

My husband is also the youngest of 3 and in his family the middle was definitely the favorite of their mother. It was painfully obvious to the other 2.

I'm the youngest of 3 and we never had any of those issues. We had large spacing so competition wasn't really an issue. My sister is 10 years older than me and my brother is 6 years older than me. I also tend to think that being girl boy girl helped. My brother acted out a lot but that's more just his personality than anything.

I can see how the issues you are concerned about might be more common in families with smaller spacing.

I'm not worried about it. I think someone will always want some alone time and with four there is no guarantee there will be pairing off. I know a family that had a set of boy girl and then another girl boy. So the genders were kinda off anyways.

I'm the oldest of 3 (girl, girl, boy with 2.5 year gap between each) and we never had any of those problems. I'm not going to try to claim that we never fought or anything but there were really no major issues and we're all close as adults!

We have 3, which I wrote about in another post. I am a big fan of the "everyone needs a buddy" system. I know there will be cases where there are 3 children and all are close and get along, but in the cases that I know of where there are 3--it almost always seems like someone is left out! For me, it's either 2 or 4! My two are BFF's and I know if I had a 3rd they just wouldn't have the same relationship as my older two have.

I'm not worried about it. I'm one of 4 and trust me there's plenty of times someone is left out, feels in disfavor, etc. IMO there's problems and benefits to every number.

Pregnant with our third and that's the reason we were on the fence about another. Now that I'm through the worst of the morning sickness I'd be open to a 4th but there's no chance that will happen. In addition to worrying that one will feel left out, I am nervous that LO2 will have a hard time adjusting. He still seems so much like my baby I can't imagine having another baby. I think no matter what, when you add a new baby, there will be challenges but no one I know has ever said they regretted having another child and usually say they can't imagine life without their youngest. I'm going with that right now and crossing my fingers for a smooth-ish transition. We will deal with other obstacles as they come up.
For reference, both DH and I are 1 of 3. He is middle with a sister 2 years older and brother a little over 3 years younger. It sounds like he and his brother stuck together a lot and fought a lot growing up. He was kind of close with his sister as he got older but have had a falling out. I have 2 older sisters but they are 9 and 5.5 years older. I felt left out a lot but have good relationships with both of them now. I couldn't imagine only having one sibling!