I bought my trusty Beko over 7 years ago back when I was single and 6kg was more than enough. Fast forward till today and it's still going strong, if a little prone to swallowing colour catchers and then not draining... Husband has become a dab hand at fixing it though but everytime says we should get a new one.
I've always replied, it still works so why waste the money, but now that baby number two is expected to arrive in the next month I am starting to question if it wouldn't be more sensible to get a newer and bigger machine?
YABU - it works fine and 6kg is enough for now
YANBU - you'll wish you did it sooner