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Unfortunately, using either RANKX or TOPN are overcomplicated means to solve the problem.  IWs should not have to create new measures every time they want to scope or limit a result set to limited number.

RANKX has proven useless for me in a situation where I have over 200,000 rows in my dimension table against a 600,000 row fact table. Even a beefy Alienware laptop with 32 GB RAM could not process the measure.

This should be part of not just the standard table or chart functions (as it is in excel), but would be useful in Q&A scenarios where I could type in "Top 25 cities by gross revenue" to give me a scoped result set.