Ah, the worlds of lawyers and technical stuff collides....
Probably, if you look in your checklist, you will not find a 'land immediately' emergency. You, personally might think an emergency warrants a 'land immediately' label, but the manufacturer's lawyers probably don't want to ever see those words in the flight manual / checklist, for liability reasons.
Hence the 'land as soon as posslble / practicable'. What does the flight manual define as 'land as soon as practicable'? How about 'land as soon as possible'?
What they definitely don't want is for you to do something stupid landing and then blame the company for making you do it when it wasn't needed.