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Don't do this. Place both ss and t before the input -i.

As output options, ss waits till the first KF after the given value, it's not a seek. With a t of 2, that may very well result in an empty video stream.

Of course (pretty sure LosslessCut using ffmpeg under the covers). But this is probably one of those instances where having a GUI comes in handy. You can quickly scrub the video for the exact point you want, see where the closest I frame is (read: the place where your cut is going to start), create multiple cut segments, etc.

For simple cases where you just cut a single clip out of a longer file, I find CLI to be faster. For more complex stuff like joining several clips together or manipulating multiple files, GUI is usually the better option indeed.

Losslesscut is infact a front-end to ffmpeg afaik

Yep, it's ffmpeg with 400MB more Electron.