Also recently bought by Atlassian.

Not sure about the other stuff, I love Trello, but that purchase gave me pause.

Yes that's another thing in the negative column. Confluence and JIRA are even worse in their own magnificent ways.

I used to hate JIRA until I worked with a company whose admins had taken the time to configure it properly to fit into their workflow - that was actually a very pleasant experience.

Dying product? This sounds like blatant propaganda sorry.

Most of the so called clones don't even have basic stuff like using Command-v to paste pictures right from the clipboard directly into some card and you tell us Trello is dying?

Trello is UI-wise the best kanban thing by far. All clones might look like Trello but their usability has so many glitches and is always inferior.

Besides, nobody needs nested boards, just make another board. Moreover, it is common that after a while a board should get archived and a new one should be created instead. Otherwise it gets too messy and I don't want to imagine how 'nested boards' look.

Edit: thanks for the downvotes, would love to hear your opinions instead

I thought you were doing OK until you said "nobody needs nested boards."