It's never as easy as it looks. And shows like this shouldn't be shown as entertainment they're real people's lives not fairytales. There's so many conflicting emotions involved.
I remember the old days of "Surprise Surprise" with cilla black as a kid and thinking how nice it looked everyone meeting up and hugging and then as an adult with an adopted dh realising that it doesnt always end up happy even after the initial pleased emotions. It's a massive thing for both sides of the adopted baby.
My dh found his birth mother eventually they met, she was from another country too but luckily spoke fluent English, they me it was lovely then they drifted for a bit, because it was all too much she hadnt told anyone about him including her dh and dc so a massive grenade was thrown into their lives. She later admitted she was overwhelmed and struggling. Unfortunately she died so we dont know how it would have been long term but I think they were both sensible enough to handle it. He didn't expect anything from her, she didnt try and "mother" him. I'd like to think she would have been a good, big part of our dc lives.
His now divorced adopted parents had different views. His dad not bothered at all, his mum making the right noises but obviously heartbroken and so jealous she couldn't even bring herself to mention her when she died. In fact I got the distinct imression she was relieved but I may be doing her a disservice. But she said to me once when alone how "She'd hate her if she upset her ds" there was such venom in her voice but I guess she was being protective.
I do also think it made her much closer to her adopted daughter and favour her as she hasn't "betrayed her adopted parents" for want of a better phrase. Sil vocally said she would never trace her birth family.
With adopters in those days there were often fertility issues as with mil. Nearly 20 miscarriages she had, that must take its toll on someone and affect their mental health which then means her emotions are tied up with the adoption and their feelings on the "birth family" and the impact on the childrens' lives.
Throw in prejudices from religion, society, social class, lack of access to contraception and abortion, abuse and many more factors and it's an absolute cocktail of emotions, not an hojrs cosy viewing for unaffected people on a Sunday's night...