There isn’t really a correlation between the number of LUNs and how high end the system is. EMC limits the number of LUNs so that if you are a big shop with lots of LUNs you have to buy a bigger unit. Others do the same.
If you will only need 2000 LUNs over the live of the array then it really doesn’t matter what the upper end number of LUNs is. For those that support 60k LUNs that is just marketing. Odds are the array doesn’t have enough IO to actually support that sort of workload.