Before asking for any kind of size or complexity estimate, I ask “is this card ready?” and “is it as small as it can be…yet?”. If we agree that the card was ready and that it is as small as it can be, I suggest moving on to another card.
A few years ago I heard about the #NoEstimates hashtag that was causing a noise and confusion on Twitter - probably the Agile For Humans podcast. A bit later I started listening to the Scrum Master Toolbox podcast hosted by Vasco Duarte, where the approaches that underpin #NoEstimates come up quite often. Considering that Vasco literally wrote the book on #NoEstimates and is a tireless proponent of the idea, he is remarkably restrained on the podcast.