"Mutilated the hammer" may be a bit unfair. If someone bought a beautiful antique gun today and did that I agree - buy a modern gun with a spurless hammer. There are plenty.
But the gun may have been very young when that was done. I bought a Ruger 10/22, a classic gun. I changed the sights, trigger, barrel and stock. It is better now. Not for a collector. I hope guns are still legal in 100 years. I have all the original parts. But someone, kid, grandkid, great grandkid, will undoubtedly separate the gun from the parts. A collector in 2104 (100 years later) may complain that the gun was mutilated. I had my reasons. The trigger was too heavy and the aperture sights that I installed make it a lot more accurate. The barrel? Probably helps but not noticeably. The stock? Looks cool. My gun.
By the way that gun of yours is sweeeet! Bobbed hammer or no.