“Powerful enough for productivity tasks” is very variable depending on what you need to be productive in. Office sure. 3D modelling? CAD? Video editing? Ehhhhh not so sure.
I don’t know enough about CAD to comment but video editing is considerably more expensive now for a bunch of reasons and I don’t think an Amiga could handle it now.
Video compression is a lot more computationally complex now than it was in the 90s, and it is unlikely that an Amiga with a 68k or old PowerPC would be able to handle 4k video with H265 or ProRes. Even if you had specialized hardware to decode it, I’m not 100% sure that an Amiga has enough memory to hold a single decompressed frame to edit against.
Don’t get me wrong, Video Toaster is super awesome, but I don’t think it’s up to modern tasks.
And you’re aware of all the reasons why that hardware wouldn’t handle modern workflows, right? Show me an amiga that will play 4K video let alone render it.
And they did video editing on Amigas with an add-on peripheral called a Video Toaster.