People have tended to take the original Scout parameters established by Cooper & his "Scout Commission" who defined them and modify them to their own preferences & reasoning.
Cooper's original reasons for setting up a true Scout, as he saw the gun, had certain features to address certain functions he felt were needed.
A detachable magazine was not an original "need". The Scout was never envisioned as an extended engagement combat weapon. Reloading reasonably quickly was a desirable feature, a detachable mag that could drop out at the wrong moment and/or get separated from the gun & lost was not.
In fact, neither was the scope an absolute requirement. But, if the scope was used, it was forward to allow a natural point-of-balance carry and to leave the top of the receiver clear for clip loading on a Scout WITHOUT a detachable magazine. And thirdly an EER type was used more to provide a single aiming point than for conventional magnification.
A further benefit was "both eyes open", which was beneficial in keeping a broader eye on the scene in front of the rifleman.
No, there is no overriding reason to top off a detachable magazine. But, for those of us who don't like that 10-round in-the-way magazine & won't buy the Ruger because of it, a stripper clip set-up would be nice IN ANOTHER SCOUT version.
For some of us, what you find a benefit is a deal killer.
I owned an original Savage Scout & tested their revised Scout. Both good guns, I thought. But, those removable mags were 50% of the reason why I finally sold the one I'd bought.
If you like the new Ruger, enjoy it.
For me, ten rounds gets in the way & five rounds doesn't justify a detachable.
For others, the Ruger Scout is viable. It IS an interesting gun & I'm glad to see Ruger working beyond the box in bringing it out, and no maker can please everybody.
This thread's got me interested enough in the Compact Magnum in .308 to give that one a try. Little bit longer, but a 20-inch barrel with sights has some appeal, and four more inches of velocity. Standard bottom metal, and I can live without the flash suppressor.
Denis