There’s hotkeys for workspace navigation, I use them all the time: Super+Alt+Left/Right will navigate to the next/previous workspace (Super+PageDown/Up also works). If you go in Settings -> Keyboard shortcuts -> Navigation you’ll find more, notably to move windows between workspaces.

As for the fullscreen by default, there’s extensions for that I guess, though personally it doesn’t bother me since after the window is maximized once it should restore its maximized state the next time it’s opened. With Super+Arrow keys to position the window, I personally barely use the mouse for window management.

Qalculate!, the calculator I use every time I need to do a calculation, especially if it involves units or currency conversion. Does everything I’ve ever needed out of an everyday calculator (even symbolic calculation and exact results), while keeping the usual simple calculator interface.

I’m aware of LWT and LUTE with the same concept. Neither comes with predefined languages or texts, so they should work for any language as long as you have some texts you want to read.