I get where you're coming from but Linux exclusive desktop apps are so rare that it is probably worth it using tight platform integration as a way to convince users we have quality, nicely designed desktop apps too, especially considering Todoist have a Windows app but not a Linux one[1].

1 - https://todoist.com/downloads/windows?lang=en

I totally understand why. It just felt weird the first time I came across a beautiful Linux Mint app, that couldn't be ported to windows..

.. the cool thing is, that it is possible with WSL and it probably will be almost seamless in the future - without additional work for the devs.

I specifically want to use Planner because of the local mode. Afaik ther are no nice local-only todo apps for windows with sub-task support.

> considering Todoist have a Windows app but not a Linux one

Todoist does have a Linux app, although it's effectively an electron wrapper around the web app. Having said that, I don't think this is unique to the linux version though? https://todoist.com/downloads/linux

From the screenshots it looks very similar to Microsoft To Do: https://www.microsoft.com/en-us/microsoft-365/microsoft-to-d...

Linux is open-source so it tends to follow that open-source projects choose to develop for it too.