"Alexa, repeat my last toothpaste order" with a confirmation if the price has gone up would be good.

With the exception of foodstuffs, where I don't want to have to worry about perishability and storage, I've got most of these on scheduled deliveries - toilet paper every 4 weeks, laundry tabs every 6 months, etc. Once you figure out the appropriate rate and with a little bit of buffer stock to account for variability, you never run out of anything.

I don’t want toilet paper every 4 weeks, I want it when I have 2 rolls left. If we’re away, that might be 6 weeks. If we have family visiting it might be 3 weeks. If I buy toilet roll in the shop, my subscript still comes unless I cancel it.

To be clear, these are minor complaints, but they are the things that asking Alexa to order should solve