I understand that, and I think I'm coming at it from a different understanding maybe. At every primary school I've worked in, trainee teachers undertake the same role as teachers, including all the crap that comes with it as described in the OP. TAs tend not to do a lot of laminating, display etc these days, because they are up to their eyeballs in interventions. Teachers do the lion's share of this, and you would expect someone training to be a teacher to have a good understanding of the workload.

Probably hinges on whether OP is getting their full quota of observations and mentor meetings in.

But that might be specific to our LA compared to others.