Try the mass equivalent in titans, not a monkeylord.
All you've shown is that monkeys aren't good at killing mass t1 spam, not that t1 spam is OP. I could similarly ask a strat bomber to kill inties and complain that the inties are OP, when in fact, strat bombers are not made to kill inties.
Additionally, you've chosen a map with a lot of wide-open spaces. Yes, on maps like that, spam rules. But if spam is so OP, why is it barely ever seen on even semi-closed maps like Canis?
Most games end in the t1 stage because someone makes a mistake and the game doesn't last long, not because t1 is better than t2 or t3.
Lastly, you aren't considering the efficiency of having all the dps in one place. If you want to do 4000 dps to something, do you throw 360 t1 maas at it? Really? What about 8k or 12k dps? How are you going to field 1000 t1 maas? How are you going to make them? A monkeylord takes 27500 seconds to make; 300 t1 maa, 66000, and that excludes roll-off time.
For some context (because I personally have not seen t1 spam "20-30 minutes into the games on ladder and in every teamgame that is not astrocrater"): what maps are you playing and what rank level? You're talking as if you played astro all your life, tried 3 wonders, and are balking at the fact that people build things besides GCs and t3 artillery. If t1 spam is really "blatant power creep," then go ahead and make t1 spam 20-30 minutes into a ladder or teamgame vs. 1500+ players on a semi-closed map, and tell us how that goes.