I have had a WR Single Trigger Droplock built in 1904 for years, and know the penalties of detachability.
A factor not often mentioned: LOSS of the detachable bits. My Droplock does not have the hinged bottom plate. A push on the release button drops the plate right off the gun, and this has happened a few times.
Friends who own detachable guns have lost bits over the years. An AYA No2 has lost a lock plate on a woodcock hunt. A Fratelli Gamba has had its trigger group stolen at a Skeet club gun rack. It was later ransomed for an undisclosed sum.
Serviceablity is an issue only with through the grip screws. You can pull the stock, on a stock bolted gun, dry and service the internals just as easily. And you do a more thorough job.
Not having detachable bits also avoids requests to demonstrate the feature. It may be an ego boost for some, to show off their guns locks, it is a PIA for many others.
