Yeah random crits would really really help howies vs tanks, and make a huge amount of sense!
One great thing about howies, is they come at 8 CP. So in 1v1 or 2v2, if you know they have gone fairly defensive you can get a fast howie instead of tecking, defend it with T1/2.. and pummel their sim city / OKW trucks.
In fact, you can even ignore their doctrine altogether with this approach, because you start bombarding them at 8 CP, most of the arty counters come at 12 CP. Giving you a window to do a lot of damage.
Even if they unlock an off map, they need to get line of sight, which is tricky if defending and getting bombarded, if they are lucky enough to have a recon and arty strike, thats a lot of munis, munis they need for other stuff, and by this point you may well have them on the ropes anyway.
(this works really well with Soviet Combined Army vs OKW, cos you get Guards to flesh out your T2 build, camo for ZiS, you can use recon plane to increase accuracy of howie, and even get IL-2 bomb drop to seal the deal on any defenses once you unlock it
Rocket arty on the other hand, is true late game. Just some perspective.