So, Matt commented in the other thread that NSFW content is not coming back due to the difficulties around hosting and processing adult content (payment processing, advertising, everything).
Where does Tumblr fit in 2020 between Twitter, Medium, and Instagram? What's its medium?
Also, because tumblr makes it easy to create side-blogs, you can follow a favorite person for their specific stuff. For example, if my artist friend has an "inspiration" blog I can follow that blog instead of their "personal/vent" blog. Similarly if I'm looking for some kind of tea-specific blog I can follow a stranger's side blog without needing to also be exposed to the stranger ranting about a political opinion I am uncomfortable with.
Furthermore, it's one of the large social media sites for which there is a significant and semi-permanent resource and groupings for a variety of LGBTQ/diversity/political/fandom interests in a way that is more flexible than a subreddit or an interest forum. You can follow the individual blogs that you're interested in instead of needing to follow a whole community. So if you don't want to be exposed to some aspect of a community it's relatively trivial to just not follow the people involved.
Twitter has a lot of this, but the lack of easy threading posts and out-of-order feed really ruin it for me. Several of my favorite artists left tumblr for twitter and I've had very little success following them from there.
I always understood Twitter to be a personal text broadcasting service, i.e. single direction communication, not conversation.
For me it's just a nice/easy place to post stuff & get quick feedback/appreciation. It's also nice to scroll through nice/funny/cute things & sometimes get info on issues that the tumblr community cares about.