Been thinking about this post by @jukesie. I reckon it's something to do with pace layers of whole career, day-to-day delivery, and everything in between https://digitalbydefault.com/2020/02/12/multi-hyphenates/
Of course it's a truism that many of us will do many different things over the long arcs of our careers. I've travelled from journalism through web content production, product management and service design, and I'm not done yet
On the other hand, specialism matters, especially when establishing new skillsets in an organisation
Moreover multidisciplinarity surfaces productive tensions - between design and user researcher, product manager and delivery manager. This forces teams to make their assumptions and trade-offs more explicit than if all that happened inside only one head
Of course there are many people who can do several of those roles, but it's a good sign that an organisation values deep specialism when it allows them to focus on doing one job well for a sustained period of time
And once inside a multidisciplinary team, we want people to bring their whole self to work, and use all their talents. Titles matter much less in a high-performing, high-trust team, that has all the skills it needs to get the job done
It's an important message to - for example a user researcher - that we value your skills so highly that we will hire for those alone, not ask you to do other adjacent things too