@CBHessick I thought so, too, when I switched from Twitter to Mastodon in April 2022. I quickly learnt that it is not. It is a deliberate, well thought through design decision, cf https://mastodon.social/@Gargron/99662106175542726, https://scott.mn/2022/10/29/twitter_features_mastodon_is_better_without/, or https://absolutelymaybe.plos.org/2022/12/01/reflecting-on-twitter-white-flight-quote-tweet-tensions-at-mastodon/
@CBHessick You're quite right in my opinion, and there are ways to achieve the result of a QT with comparatively little effort (cf https://nerdschalk.com/how-to-quote-someones-post-on-mastodon/).
But Mastodon has emphatically not been designed to be a replacement for Twitter, despite many journalists pitching it as one. However, it is also open source software. Typically, when a demand arises, someone will eventually implement that feature, if only for their instance. I am quite sure that someone will offer QT soon.
It appears, at least in my little archipelago of Mastodons, that there's a Great Quote-Tweet debate happening. One person I respect asked pointedly to see data that proved QTs were abusive. Since I've been researching affordances of social media platforms I pulled some bits and bobs out of my hideous pile of papers and thought I'd share some insights with y'all about this question. Cards on the table: I think QTs are a net negative. But nothing's ever simple.