I think there’s two things here:
First – how much Year 4-6 primary students need that degree of tech for schoolwork at home. I’d doubt they will be allowed to (need to) take them to school to work with and, from the amount and type of homework my 10 yr old gets, he doesn’t need a dedicated iPad of his own.
Second, it then might depend on how linked into MS Office 365 the primary school is. I work in a sixth form college and we’re only now really getting on board with the integration between Teams and Onenote (obvs accelerated massively due to CV-19). Those students in my classes who have iPads with pens do have an advantage just in the simplicity of accessing the work, taking notes on ‘handouts’ and generally taking advantage of the benefits of O365.
Personally I don’t think I would. I’m not looking at getting an iPad for my son until secondary school and unlikely then (as his prospective secondary seems a bit ‘rural’ when it comes to IT integration).
Hope that helps.