Re: why buy armor?
			 
             
			
		
		
		
		hmm - the usual lack of appreciation of the combined arms equation, I think is your problem. You talk tanks vs infantry, with absolutely no mention of the third arm of the triad - the artillery.  
 
Tanks tend to be survivable vs HE (which is why they were developed in WW1) - whereas grunts are still at WW1 levels of protection versus HE. 
 
So - try buying some arty as an antidote to dismounted infantry. (Plus - as arty is not restricted to having LOS, you can pound the ground on the approaches to objectives to discourage walking grunts approaching them). 
 
As to "barely 40 hexes to cover" - then you could always try a wider and/or deeper map perhaps, if you think the default is too small?. (Preferences, map widh and height). 
 
Cheers 
Andy 
		
	
		
		
		
		
		
		
		
		
		
	
		
		
	
	
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