5'8" is not on the lesser side of point guards at Iowa State's competition level, nor is it an indicator of a disadvantage.
These are the heights listed on each respective team's website for their roster of the shortest starting player on each of the Big 12 teams this year. Also of note, some teams have multiple starting guards below 5'8".
K State has tall guards, and Emily is of course listed at 5'11.
6', 5'11", 5'9", 5'7", 5'7", 5'6", 5'7", 5'5", 5'5", 5'3"
Let's say that starting guards does not equal quality guards.
Here are the heights of the 2021-22 year 1st and 2nd team guards.
The two shortest players were on Baylor, and they won the conference last year. The tallest guards would be Vivian Gray and Lexi.
6'1", 6'0", 5'11", 5'11", 5'9", 5'8", 5'7", 5'6"