You are repeating your "side tech" argument again again like a broken record in every thread although it has been pointed out even by moderators of this forum that it is mute.
Grenadier cost 240 manpower which is exactly the same price as conscripts and that is a simple fact.
It inflates the cost and that is undeniable. Purchase price of cons and grens are the same but the fact that if you say, go ostroppen in the preview your tech costs are the exact same as if you go grens but if you were to (for some reason) spam CE and never build a single con you would save resources on tech means cons are more expensive.
CON tech is a cost that only affects cons. They are linked. If you build no cons you do not want to get these techs. If you build cons you probably will. The costs are linked. If you build only 1 con, the techs may not be worth while as they inflate the cost of cons. If you don't build a con squad until you have heavy Armour on the field they will not be fully equipped and require additional investment to get fully kitted
If you never build a single gren you will still tech up. If you build only grens you will still tech up. If you build 1 gren teching up is still cost effecient for kitting out grens. If you don't build a gren until you have a tiger out you have spent only 240mp and have everything you need (obviously discounting weapon upgrades) for them to function. You have no additional costs. 240mp covers everything.