Of course those players would get some benefit from the 4 day stuff, but like professional cricketers all round the world players are well use to changing quickly from one form of the game to the other, which is why most of our top players are still playing in the ODI series, it’s just a mindset attitude.
They haven’t played for about 2 weeks, so the only conclusion I can come to is they were sent home for a bit of a rest, which is a joke anyway.