During the current batch of moderator elections at Gaming, it has been argued that since only 2 seats are up for grabs in this round of elections, it only makes sense to cast ballots by only ranking our top 2 choices. After all, in the sites' first round of elections, we were asked to rank the top 3 candidates and 3 was also the number of seats up for grabs.
I always thought the "rank the top 3 candidates only" thing was put in place to simplify the voting process, as the precision gain of ranking more candidates (and thus picking a 4th choice, and a 5th choice, and a 6th choice...) would have been too little to make a difference.
In this sense — the tradeoff between the precision of the election process and the ease of voting — does it make sense to rank $k > n$ candidates in a Meek STV election when only $n$ winners are going to be declared?