Very true. But in that case, the side "losing out" would be the one that wasted its reviews on 50:50 calls. Hence, in a way justice would be done. They tried to get "cheeky" with their reviews, and wasted them on 50:50 calls - now when they
really need a review, they have none left.

But now that's addressed because if only 1mm of the ball hits the stumps, it remains with the on-field umpire's call!
Perhaps, but the way I look at it is this: the purpose of the technology and of the DRS is to eliminate howlers.
Everything else is not its purpose, its a by-product.
If less than 50% of the ball is hitting the stumps, then by definition, it is NOT a howler whether the on-field umpire gave it out, or he gave it not out. Instead, its a 50:50 call.
On such 50:50 calls, technology is not the Master - the on-field umpire is
However, if more than 50% of ball is hitting, that means it is more clear-cut.
And if the whole ball is missing by 4 inches and is still given out - now that's a howler!

And for that we have the technology.
No, that's a wrong way to read the whole issue, IMHO.