Such concern was already stated at relevant DD... It's quite probable that 2 only important sliders might be officers and R&D, while you can neglect diplomacy and espionage alltogether (either minimal spending or delay on slider changes was suggested, wonder if it gets in).
I guess full campaign will tell us if it's perfectly valid strategy, or do you actually fare better using espionage and diplo options.
Diplomacy would be borderline useless for USSR in 1941 in any case, as it has no close ideological friends other than Sinkiang (and no prospects, really - everyone else is on the far side of the triangle). The 1936 scenario would demand a different approach.
I don't really see how intel can be "neglected altogether," but Mosby doesn't really have a choice here.