I agree with you. The Sabra does still have a weak engine after adding nearly 250 hp. I see the original speed and the Sabra speed the same. It is not improved. But there was an option for a 1200hp engine. I hope that after the 170 MBT's the others will be upgraded by 1200h or even better engines to overcome mobility problems. Turkey also doesn't have plans to invade countries and therefore the Turkish army have chosen to this concept I think. Just be modern. Also the tech transfer is Turkey main interest and not the Sabra himself. The 170 Sabra's tanks is just a 'gift' when buying tech for our laboratories...
You are right about that we don't need to talk about the ability of the neighbours to overcome the defense of Turkey.
But for a mobile offensive the Sabra is really not the best choice it is just not mobile enough. If for example the Syrians have a mobile defense the Sabras would not be able to run through the enemy lines like the Turkey LeoIIA4 would be.
While facing Sabras it would be easier for the T-72s to retread into another fire position and start a new game.
And Greece being just a small stone in the way of the Turkey?
You don't really mean that, don't you?