As has been said, short is good for use with clipons as a primary use case for me ! I do 80% of my shooting at night. And mounting the SIMRAD 253 is easier on shorter scopes. I got this Mk6 3-18x in 2014, so not a "fad" for me
It weighs 23.6 oz and is 11.9 inches long. I managed to get a sun shade for it from L&S !! My biggest problem is the diopter is tough to adjust. L&S says this is true and is due to trade-offs they worked thru when trying to make the scope this small. So, there will be trade-offs, as has been mentioned. But in terms of results, this scope has a slightly better record than all my other scopes for 100yds dots, with 65% center punches on the (3/4 inch) dots.
==
Then there is weight. I was trying to make this 7.62(20), based off REM700 SPS TAC AAC-SD barrelled action be MUCH lighter than my 7.62(22) AIAX ... and it is by 4 pounds ... but its still around 15 pounds when ready for the field (vs the AIAX 19 lbs). Need a lighter barrel ,but that would sacrifice ROF, so haven't gone there yet.
The NF 2.5-10x MIL-R weighs 20.8 oz and is 12 inches long. Its a great scope for night shooting with a large FOV. But can also keep up with the big scopes on first round hits on 12 inch steel out to 900yds during wind practice. Night or day (heated steel at night for the thermal).
==
That said, I also have a NF 7-35x ... so I'm not totally in on the shorty/light scopes ... about 50/50 is my current balance and that seems right.