Why do people base zodiac compatibilities mostly on Sun signs instead of Venus signs

I see a lot of readings on sign compatibilities and that Sagittarius suns usually find it hard to settle down etc. because of their flighty nature and impulsive passionate nature. I hate it when people generalize Sag suns as these because I myself am very cautious and take a long time to fall in love and still hold on to the relationship long after it was over due to my Capricorn venus. I do understand that sun signs have an influence in this area but surely that doesn’t mean that it should speak for what signs they should be compatible with?
Please educate me on this matter for I admit I still have a lot I don’t fully understand about astrology.

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