I did it to mine.
I have a ~2500 converter that actually footbrakes to 2800 behind my 427 in the heavy Chevelle, so with the slightly loose converter it isn't a killer hard shift at low rpm, it gets pretty firm at 1/2 throttle an higher.
I think converter selection and personal preference dictates this more than HP rating etc..
My trans doesn't shift killer hard even at WOT though... even with the accum blocked. Maybe my seperator plate holes are more conservative.
A 700-R4 is a completely different animal so I wouldn't compare the two for purposes of this discussion.
Also the 200-4R, if you retain the cushion spring on the servo, it acts as a secondary accumulator, and IMO should always be retained to prevent band lug failure.
Many builders omit this spring, but leave the 1-2 accumulator partially functioning...
I would rather block the 1-2 and retain the cushion spring....