10 years ago it was at very slow pace of development (don't know how it is now). but the blocker for me back then was the need for SSH access (which greatly limited choice of suitable shared hosting providers) to run composer for installation and upgrades. while with phpBB you could just upload it via FTP, open installation url and you are done.
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I was looking into forum software maybe 10 years ago and came across Flarum. Worth a look
https://flarum.org/
10 years ago it was at very slow pace of development (don't know how it is now). but the blocker for me back then was the need for SSH access (which greatly limited choice of suitable shared hosting providers) to run composer for installation and upgrades. while with phpBB you could just upload it via FTP, open installation url and you are done.