How will an invasion of the USSR even get past defensive lines with no Molotov-Ribbentrop Pact, a lack of crucial Soviet supplies to the Axis as part of that Pact, and no Stalin ignoring/suppressing every available scrap of intel that indicates a clearly incoming Axis attack?
Well, yeah, as I said:
That I can agree with. You either need a Stalin who is quite different from the OTL one or someone other then Stalin altogether getting into power. Both unleash butterflies well beyond the purges...
However, there were people here who were quite insistent on having Barbarossa occur largely as per OTL and the consequences of a lack of purges on that, so I provided an answer on that basis. I should note though that any Red Army that deploys along the 1941 borders is probably going to see that defensive line broken through by the Germans due to the logistical dislocation that would be imposed by moving so far west, purges or no, MR Pact trade or no, surprise or no. Now, the logistical impositions from the lack of MR Pact trade would leave the Germans unable to exploit their breakthrough as effectively and the lack of surprise and purge would impose more damage to the Germans in the process of breakingthrough Soviet frontier forces, which would have significant knock-on effects further down the line when the Germans run into the Soviet reserves. Lack of purges would also mean those reserves are better led and lack of surprise would mean they are larger owing to earlier Soviet mobilization.
However, it's also quite probable that the lack of purges allow the Soviets theorists to finish their work on deep battle in a defensive sense (that is, accepting a defense-in-depth if necessary), which means that the 1941 frontier would only have a tripwire of NKVD border guards while the main line of resistance would be considerably further east, probably along the OTL Stalin line. An extended delaying battle away from the frontiers while preserving the bulk of the army in depth, at the range at which the German logistical tether would be stretching to snapping simply through the act of moving eastward, would have worked out much better for the Red Army then their attempted OTL strategy which was roughly a year away from having the logistical apparatus too work.