Ah brilliant the joy of PPrune!
There is no evidence that the phraseology quoted by TOGA was actually used, in fact in my career I've only ever heard phraseolgy as poor as that from flight crew.
Any 'UK' trained controller worth their salt would never use phraseology like that, I think we're being very presumptious to assume all DXB controllers would do!
The tone of TOGA's post suggests to me that he thinks all conditional clearances have an element of danger, IMHO they do, but when used safely with a positive clear readback, they are fantastic tool that allows the controller to move onto their next task.
As ever ISTBC
HD there are more runway incursions at LL now as the definition of what a runway incursion is has changed! Did you really only see 2 in your 20 odd years? Don't forget that an out of sequence line-up caused by a missed read back or flight deck confusion counts. At LL before we stopped multiple conditional line-ups, one a day of these incursions was a regular occurance.