I ran a G28 improved setup on my MR308-G28 for a while. I actually still do, but will move the "chunk of 5x25x56" to my .338LM.
It really depends on the philosophy of use. If I want to engage targets as accurately as possible, yes, by all means, a large chunk of glass shards embedded in a metal tube on top. Or if your ROE dictate very good target id, like the Germans in A-STan opting for that 25x opticfor that reason.
If you intend to hit a 30x50cm target (so about 12 by 20 inches for you USA'ians), out to 800 yards, a good 6x is all you need to be very much in the comfort zone. And you will have a significantly more flexible weapons system.
If you intend to be a marksman as precise as possible with competition shooting, by all means get that huge chunk of optic on the rifle, get it as heavy as possible to migitate recoil, and kit it out. But its not going to be a practical weapon anymore.