Although the slightly limited market and high cost in making Clausewitz run on android/IOS is probably too high to warrant doing. tldr a touchscreen and a mouse do almost exactly the same thing).

I can't think of any modern PDS game that requires an input not replicable on a touchscreen (unlike say, an FPS, which requires a bunch of inputs in different ways, replicating a joystick through touch, triggers through taps. Although It would be a lot of work and resources - There might be a market for PDS style games on tablet (Firaxis strayed in with Xcom on tablet, and then later with Civ6) - or for people who just want to play PDS games on the go. The Stellaris: Galaxy Command beta is available now on Android and iOS devices, but for the time being only to players in Australia, New Zealand, Canada, and Sweden. I feel pds should be spending resources on making sure touch devices are compatible, not only for PC, but for eventual port to tablet. This is going to be an unpopular opinion (but):

How to play stellaris on android