Touchscreen + Step Sequencer = ?

Touch works fine with Step Sequencer. The squares are just big enough that you can reliably touch the one you want. You can easily expand the row settings to show velocity etc. You can adjust the velocities (or any other parameter). And you can use the scroll bar on the right hand side of the screen to move up and down through rows in Step Sequencer.
 
I like my touch monitor and have no regrets about it.
 
Videos about touch are a little tougher to make for novices than videos where you can just take a screen capture because you need to film yourself touching the screen with a separate camera and blend the two together. That's the main reason I don't make videos showing how I use touch.

Works for me in step sequencer to touch and delete a note. For me, tapping a note iterates through regular, flam and off.