You do realize if anything they have would be separate upgrade, initial price and therefore reinforcement cost would need to go down to balance it out, meaning they would be easier to spam?
Because you are completely ignorant to actual balance and stats, that's how they worked in the past, weapons were an upgrade, they had ability like storms that also suppressed and they were spammable monsters.
You are ignorant to balance not me imo - I don't understand why they don't ban U for personal attacks like that.
To the point. The whole problem is about making soviets pay munitions for things, not balancing shocks, (which is another story). Unlike other factions Soviets can spam mines and offmaps more, because they need less munitions for basic stuff. Shocks are just an example of a unit that is very potent without upgrades and thanks to it, the faction can accumulate more munitions during an even matchup creating advantage.
I don't think that requiring an upgrade to purchase the shields reducing the damage would be such a bad idea.