I can understand what you mean. I am merely comparing cost.
I somehow think the cost of buy a different case compare to pvding an existing case is almost the same. (with the exception of ultra complicated case i.e. Antigua, RM or De Bethune)
We can argue about Panerai lack creativity in terms of designing a new model for the historic line (honestly do we want to be that creative to pay homage

)
What we can't argue is it cost less to produce a similar looking watch than a radical different watch.
Things that looks different, feel different may not always cost different. The question we need to answer is do we justify in paying a high price.
One thing I salute Bernard Arnault as a savy businessman is the ability to reduce cost while making a product appear to be more expansive.
Then again I'm an odd person and my reasoning may seem weird to you.
Regard
Tyler
it is also misleading by telling selective facts, a trait commonly used by "apa-nama".
it doesn't reflect the real situation by just counting the number of changes. we have to consider the degree of change involved.
using a simple example here.
0 vs 360, dial, markers and case -> 3 minor changes
tag vs zenith, dial,markers, case, straps, pusher buttons, crown -> more than 3 radical changes.
if tag and zenith are deem "no different" then we only have a lot of "no different" watches with 6497, 2824/ 2892, 775x, 5100 taking the lion share of the world watches.