Yes! it's wasteful energy wen there are plenty of people that's suitable for you or the other person..

At the end as you have said there are two sides to a coin but some people actually needs individuals adjusting and chances are if they don't try to correct some of their flaws, not for the relationship or the upcoming relationship...... but for themselves!

That way in any relationship they will already know who they are, and be whole and not fragile or confused about their romantic choices.

I also believe we confused with things that's common btw the
two in the beginning,
with the chemistry as being appropriate enough to say, this is the person for me.

sometimes chemistry is just way to reach a level of friendship and nothing else.