I have shortly made some benchmark comparing eMMC and microSD (Mini M8S II).
16GB eMMC:
read 43,1MB/s
write 19,9MB/s
16GB Lexar microSD (LSDMI16GBBEU633A):
read 50,8MB/s
write 24,3MB/s
For the Mini M8S II mediaplayer I see no reason why moving LE to internal.