The Ryzen mobiles could shed some light on the effects of chiplet vs monolithic die latency since they use a monolithic die. Anandtech compares the latency between a Ryzen 3950X vs a 4900H and its substantal. Comparing a Ryzen 3100 vs a 3300 would also be interesting, one uses two dice (3100) vs one die (3300x).
Relevant links below.
until stellaris is fully parallelized to take advantage of all the processor cores, it is useless to solve latency
so far it's like driving a car with an eight-cylinder engine on one cylinder and thinking that changing the color of the car will increase acceleration