But my point is that by slowing down the dating timescale, delaying having children together, delaying marriage, delaying buying a house, etc., you have more time to get to know each other, more time for flaws to become obvious, and sadly, yes, more time for life's problems to need dealing with, all at a time when it's far easier/simpler to separate before committing yourselves, if it turns out you're not a good fit together after all.
Yes, I know you can't possibly anticipate everything that could happen, and you can't anticipate a future spouse going off the rails, having affairs, etc., but I still maintain, that slowing things down and getting to know each other properly, warts and all, before commitments, can give you pretty good indications of whether you're the right fit together, far beyond the superficial. That takes years, not just a few months.
The old adage still holds true - "Marry in haste, repent at leisure".
I really don't understand why people are in such a rush. Well, yes, to an extent, I can understand it from women in their 30s whose biological clock is ticking, or maybe where one partner is moving abroad etc thus hastening a decision, but for most people, slowing things down and waiting before having children, marriage, etc., wouldn't really matter that much, and can only be beneficial - what's the harm?