They are considered more difficult to reload in the heat of a typical English driven shoot. They probably are, but, few of us Americans need to worry about that. What we typically partake in is known as "rough shooting" over there, and is more deliberate.
I've developed a real distaste for tumblers (hammers, to us yanks) with integral strikers (firing pins) since witnessing one break, and seeing the bill for the construction/repair of another. Neither were droplock guns, but, the idea of a striker breaking in all that damascened glory would be eye (and, wallet) opening, to say the least. A thing of beauty is a joy forever, or, at least until it's broken. Then, it sucks.
My "gee-wiz" era is much behind me, I'm afraid. My preference is toward a sound A&D boxlock, sans ejectors, or single triggers of any type, but, especially English single triggers, and equipped with disc set strikers. If you have the tool and a spare pin, you are pretty much money for most shooting you will encounter, over here.
A better traveling gun may not have been invented.
Best,
Ted
