As stated in the blog we are focusing on making few changes per patch, but more patches overall. Hence why we limited the number of balance related changes to ~5 in this patch (MRV effectiveness, Titan damage, Jumpjet resistance, Artillery accuracy, less Hijackers).
We have an internal list of balance changes we are considering which is going to be continually updated based on the balance changes made in each patch, since some changes might render other changes pointless.
Actually it has always been able to repair laser turrets, its just VERY, VERY, VERY slow. Try sitting on top of one with an MRV for a few minutes and you'll see the health go up. Hence the ~700% increase in MRV effectiveness on support buildings and defences (it'll make it repair them at a more sensible pace, without making them immune to damage from the enemy)