I moved from a MBP to a Dell XPS 13. This transition made me appreciate just how nice the trackpad on the mac is. I am no apple fanboy by any means, after my MBP died out of warranty. They wanted $700 to fix... but after some use, the XPS trackpad is a real aggravation machine. In laymen terms, it is like the MBP knows when I am typing and reduces the sensitivity of the trackpad. On the Dell, it surely seems like the Dell knows when I am typing and cranks the sensitivity of the trackpad up 10X. I consciously have to move my hands up to type, which becomes a real problem when the laptop is in your lap and not on a desk.

I have used Linux since 1992, literally, but I still find the mac os X more cohesive and fluid. Do not get me wrong, I love linux, but on the XPS I felt like I still have to futz with the OS too much. "hey, I just went to work, I am on the OTHER wifi now mr Dell XPS laptop. Hello? HELLO? OK, gotta reboot and turn the wifi on and off three times to connect". This is with the Dell supplied ubuntu fully updated. Ugh.

I think disabling the touchpad when typing is a macOS feature which Ubuntu has tried and failed to emulate.

I have the same problem big time on a ThinkPad X1 Carbon (which otherwise I love). Very unnatural wrist posture to avoid errant clicks!

There is some tool I've forgotten that disables the touchpad when the keyboard is in use. You can set the timeout period, I think that my sweetspot was 1.5 seconds.

If you can't find it then let me know, I'll google it.

It's still rather clumsy though, if you go too fast from typing to touchpad you have to wait for the delay. If you set the delay to be too quick, you will get wrong clicks. It's more a question of palm detection, and the Linux touchpad drivers are not great at this.

I started having the exact same problem when I bought my latest Dell laptop. This was infuriating at first, but slowly I got better at avoiding the problem. (Still somewhat infuriating at times.) Periodically I'll disable the trackpad entirely via xinput if it screws up my typing too much.