You spam out t1 engies to get reclaim and might keep a dozen in base to help speed up fac upgrades/assist in t2/t3 construction with more flooding in once reclaim is sucked up. Anything talking about making t2 or t3 engies adjustments or some other sort of engie won’t change anything about the reason you have like 50-80 t1 engies on many maps.
I can spend like 200 mass and have a factory producing infinite engies to get thousands of e/mass in like a minute. There is no reason I’d ever get anything with more setup cost to do this unless it’s a specific circumstance like an ongoing battle where I need bp with more survivability (navy battles).
If you want a better way to concentrate bp, assist 1 engie to a fac and assist the rest to the engie. Now you have an infinite bp glob concentration near your factory that doesn’t even really block pathfinding much.
Making it possible to combine engies to quickly get t2 in areas doesn’t really attempt to deal with inevitable engie spam so it’s more viable. In fact it benefits from it. But it also has a lot of possible abuse opportunities that would need to be reviewed.