Yeah, that's the great thing about tutorial videos, they're usually out of date almost as they're published.
Server 8.1.4 does have roadmaps, done via the Advanced Roadmaps (previously Portfolio), but as server is going away, Atlassian are not offering the app for new installations any more.
It's now only available "off the shelf" for Cloud Premium, Cloud Enterprise and Data Centre installations (and it's built into all of those, so you don't need to install/enable them)
It is still available for download in the marketplace archives, but there's not a lot of point, as you'll need to talk to Atlassian about a trial or full licence to get it working, and it'll stop in 2024 anyway.
Almost - Advanced Roadmaps (Portfolio) have been a paid app for a long time.
I wouldn't say it is of limited usefulness, just that it is currently a bit of a pain to get a new installation of it for Server because it's going away in less than 2 years.
Your best option depends on what you want to do now and in the long term, but there are three broad options:
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