So in a sense BS2 is just a patched up BS1.
When BS1 was originally released it was supposed to be a modular software
design so that other aircraft could be added easily , as time went on
this became quote "An ambition"
They took all the changes and graphics engine updates that
went into DCS A10-C (which you might have already bought)
and they decided not to call it a patch but an "upgrade" and
to charge for it again even tho you might already own all
these changes already with A-10C
Though they did fix some of the bugs they seems to have not
looked at some of the more important ones eg
you have a helicopter "sim" that you can fly through trees .....
But that is not a realism breaking problem ... is it ?
But Iam sure a new paid for patch will fix the outstanding ones