Not everyone will necessarily agree when it comes to this topic. (Also, the spring companies and vendors are in the business of selling springs.
)
When I once tried some of the reduced power rebound slide springs in one of my 642-1's, I soon discovered a couple of things. First, a couple springs in the 3-spring pack of lighter springs I ordered either didn't allow, or didn't consistently allow, the trigger to recover when dry-firing at the bench. (This was after the internal parts had been examined and "de-burred" by an experienced armorer, BTW.) Secondly, even when the heaviest spring of the spring pack allowed for consistent trigger recovery, it wasn't as brisk as it was with the stock spring. After a few months of practice I found I could "outrun" the trigger's recovery when doing some fast shot-strings. Once I replaced the lighter spring (but heavier for the "lighter" range of aftermarket springs) with the stock springs, the trigger recovery was faster than I was demanding of it.
Since I only own and use my J's for dedicated defensive carry weapons, I no longer use lighter rebound slide springs. The springs in my half dozen J's are factory (as are the mainsprings & firing pin springs).
I know a much more experienced revolver armorer and shooter than myself (who formerly enjoyed competition in the PPC days) who uses a reduced power rebound slide spring in one of his carry J's, and he's comfortable with using it that way.
For my own J's, though, I run them with stock springs. (I'll examine them and remove any burrs on parts, though.
) The factory springs are heavy, granted, but they'll also probably better help the gun run under conditions that are "less than optimal" (dirty, fouled, contaminated, etc). That might be handy for a gun used or carried in a defensive role.
There's something to be said for "improving" the shooter before "improving" the gun. (Since improving the shooter doesn't remove metal or spring power from the gun.)
Now, revolvers which aren't used for dedicated defensive roles, but just for sporting, leisure, target or competition may well be something else again ...