This is one opinion. I prefer the scalloped recoil shield. It makes the gun look more refined and sculptured. I think that's why it was changed.
I agree with you.
What collectors want isn't the same as what shooters want and with about 1.5 million of the Six series DA revolvers made over 16 years, there are not many variants that are considered to be rare or highly sought after collectors items, but they are still very highly sought after by shooters.
For those that do collect them, it's also hard to parse out where the additional perceived value is coming from - the lack of a scallop, earlier production dates in general, or pre-1979 no warning label status. It's hard to separate those three factors.
In my case, my Speed Six still works for a living and on a working gun I don't really care if it has a warning label or not - but I do prefer the scallop.

The scalloped recoil shield looks a lot better (IMHO) and shaves off a bit of un-needed weight in a revolver that is already heavier than a similar K-frame .357.
What is relevant to MY valuation of them, is that I would clearly pay more for one with a scallop than I would for one without (both for weight reasons and for looks). If I were choosing between two of them, with and without the scallop, for the same money in the same condition, the scalloped revolver would go home with me every single time.
Arguing that the scalloped Sixes are "current" production isn't accurate as all of the Security/Service/Speed Six revolvers have been out of production since 1988 - 28 years ago and counting - and they are not the same as the GP100s that replaced them.
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