Why is it so small? TKL (tenkeyless meaning a keyboard without a numpad) is just small enough, and honestly I use the END/HOME/DEL keys a lot, so I cannot conceive a keyboard without them.
The UHK is a 60% keyboard which only features the alphanumeric block. The idea is that the hands shouldn't move, only the fingers should move. This design results in heavier chording, so it's a deliberate compromise with which some are comfortable, others are not.