From: Southern California
It's the law of numbers, folks.
On a one to one basis, Soviet reactions are far less likely to occur than German ones, because on average, Soviet initiative ratings are bad. There's only a handful of high initiative leaders, and you'll be stuck using a lot of guys with 4's and 5's in the bulk of your HQs. And until 1943 there's a severe shortage of Front command capacity, so that entire command layer drops out of the equation (either in the form of overloads or STAVKA armies.)
The Soviet makes up for this by:
1. Sheer numbers of units placed in reserve, and;
2. Comrade Zhukov. No matter how bad Soviet initiative may be, it's being backstopped at the STAVKA level by his 8 rating. Now that STAVKA doesn't overload, this matters a lot.
The German can mimic this trick to an extent via breakdowns to increase their unit count, but on the whole, the Wehrmacht relies heavily on their superior command ratings. Note that Halder isn't the guy you want for this, he needs to be replaced at some point with a high initiative general, or OKH will underperform.
WitE Alpha Tester