Actually productivity involves a couple of application running together, or so I would assume. Running a single application (adobe in this case) that can't even max out more than a few cores isn't really an indicative benchmark.
And the reason I'm saying it is because even if we just compare Intel cpu's with each other, there are lower end CPUs that do better in adobe due to being unlocked, like for example 8350k > 8400 in a couple of adobe applications. That doesn't make the 8400 a worse productivity CPU.
But since we are talking about 200$ CPU, obviously no one is going to buy it to do serious production work, like hour long videos etcerera. The most common usage for this kind of CPU's would be streaming or rendering / applying filters while gaming, and that's where the 2600x shines.
Still, bottom line, if you want to plug and play, you go for the 8400. If you like tinkering you go for the 2600x. Personally I would never buy a locked CPU, since I like creating a mess in the bios