Not practical this 'get to know before' approach as only living with each other reveals much more and more after children are born (thus arguments on how children should be raised). Boyfriend girlfriend relationships by their very nature are very masked and tolerance levels are much higher, but that's only temporary as majority fail. Moving from one partner continuously to another only to find that 'perfect click' has serious effects on one's personality.
The main thing is the lack of patience in developing an understanding of each other. 'I'm right' attitude by both men and women, due to low maturity levels, pre-conceived notions (rigid mindset) and absence of balanced & rational guidance from elders, leads to major issues.
Find a partner who has same core value system as you, without a compromise and right at the very beginning. Big decisions that couples make without conflict all boil down to the principles each holds dear. Late marriage means a lot of personality traits are set firmly and very difficult to change or realign thus leaving little or no room for compromise. Focus on core values/principles is key, when finding a compatible life partner.