First thing to note is that while four steps sounds very limiting, you can repeat or ratchet steps giving longer sequences and interesting gate patterns. There is also built in clock divition.
The transpose input means Tirana can be used to modulate other CV signals without a separate addition step. For instance, put a longer pitch sequence through Tirana and put the modulated output through a quantizer. And now you have an easy way to create temporary variations in pitch.
Another use for a short sequencer is accenting the envelope by running it through a VCA controlled by Tirana.
If you are not space constrained, a Befaco Muxlicer is a good alternative short sequencer. Compared to Tirana the Muxlicer has more features overall (random step access, I/O switching, clock multiplication, interesting self patching) , but lacks a transposition function. I have both, and use them for different purposes.