We have short field NGs so LED go full extend after F25. Selecting F10 shows the same tape speed as for F5. However, the position indicator shows movement and the increase in drag is noticeable so there is an increased TE extension for F10 vs F5.
I agree. Sometimes I can hold an assigned speed (say 190knts) at F5 on the G/S, and sometimes I can't. F10 fixes that.