Sure! Swarm brome values openers above all just like any other swarm deck. 9/10 you are developing t1-3 or looking for a buff to close things out.
However, immo can still be useful in the midgame by healing up a large threat like auroara or forger (dissuades AOE in favor of dongle target in non-vanar mu) or by dealing that last bit of chip and clearing away body blocks for that grindy lethal.
Hence 2x: you’re replacing this in your opening hand, but it’s a solid topdeck for swing turns or grindy mu’s. 2x enables you to draw this consistently by midgame and (rarely) lategame if you need it while preventing 2x hand clogs outside of unlucky mulligans, increasing the consistency of your openers.
Tl;dr: 2x because it’s not universally applicable, and the one area where you don’t want it (openings) is the deck’s most important aspect. however the value is too good, so we leave 2x for consistent midgame draws
Hope this helps!