Comment by Doohickey-d
13 hours ago
These days, with LLM assisted development, with relatively simple GUIs, I would go towards platform native GUIs per platform. And then all the shared business logic goes in a shared "core", with the GUIs only serving as "dumb" inputs and outputs, with all business logic shared between them.
LLMs are quite good at tedious tasks such as keeping multiple GUIs in different languages in sync with each other.
You still need to test all of those separate GUIs though so it's still costing more.
You also generally don't want them to actually be in sync because there are actual UX differences between platforms that you need to align with to really be native. If you don't follow that then what's the point?