Yes, but the casuals for which a month seems little, don’t actually participate in LB meaning they get an extra week for character build-up, and also the cursed event at the end of the Season should be driven by AI “equaling” the skill power of pros and casuals.
So basically, if you are casual, you play on slower pace until the last week, where you get buffed a lot. And if you are pro, your main goal is LB, and last week you have fun.
But as you said, such gameplay experience would require a very serious team of programmers and very possibly a subscription mode, which could be monthly based thus some players may decide to skip a month with a Theme they don’t like and not be billed.