Am I the only one who uses coin control as the default option? Whenever I want to make a payment, I start by selecting the UTXOs I wish to spend. There are lots of reasons you should do this over automatic selection. Privacy is the biggest one, as has been discussed already. I want to spend specific UTXOs for specific things, and I definitely don't want my wallet automatically consolidating UTXOs I don't want spent together. I also don't want my wallet to consolidate UTXOs in a transaction where I am paying an above average fee for a faster confirmation - I'll consolidate any UTXOs in a combination I choose, at a fee I choose, and at a time I choose. If I select UTXOs manually, I can select one(s) to create an appropriately sized change output and not be left with dust, or spend the change somewhere else simultaneously, or create no change at all in the first place.

I wouldn't even dream of using a wallet which does not offer manual coin control, and I'd quite like to have the option to turn off automatic coin selection altogether to eliminate the risk of making a mistake.