This statement has been repeated several times here now, including by FT, but is it really true? Correct me if iām wrong but yes, they always rounded down but to the nearest whole share. See here :Feature request: ability to select to buy or sell by number of shares or cash amount - #288 by mj-investor
Now you just get whatever quantity your whole investment can buy, including fractions. The option to just buy a whole share only is not currently available except with the workarounds mentioned above.
Edit: picture credit @mj-investor