I mean, for any fan of the series it's a legitimate complaint. Even in the SkillUp video he talks about how they feel out of place and cheesy. That it almost feels like playing Overwatch on a grander scale, rather than a Battlefield title. I mean, a specialist that can see enemies through walls and farm kills with a turret does sound pretty bizarre in a BF title.
I do think it's particularly amusing that they've apparently slapped class titles on the specialists, but it serves zero purpose, lmao.
But again, as someone that has adored the series since its existence, and preordered, I'm sure I'll enjoy my time with it. Even if majority of it is in Portal.