OK here is an update which I Got from Vtech:
The SDK 2.4 has no new "big" features that Litchi did not already have, unless I missed something.
We will not create a separate app as it would require another DJI developer license and we will not maintain a 2nd version because it is a lot of extra work which we'd rather spend on new features. If you choose to stay on the old firmware when DJI releases the new public firmware, then you should also stay on the old version of Litchi, simply because we will no longer test/support older firmwares.
The new SDK 2.4 will set a altitude limit while using Litchi.I use Litchi when flying in mountains and start at the bottom.Meanwhile I stay at 30 mtr above the ground I can go up over 500 mtr altitude.
I do this for my job to make this clear.
When I bought the Inspire these limits where not there.I do understand when you go up 120 mtr vertical above that it will be dangerous and I don't do this.
But it 's clear to me that more limits will be build in with the new firmware,so for me upgrading comes to an end.