Why, though? Such essentially just asks that we be even slower to ramp up and have less agency (in that we’d have fewer situations in which to viably burst into a target immediately) and narrower capacity (from that further decreased flexibility).
A truly baseline Latent Poison is much the same. In practice, it acts only to restrict playflow options, narrowing our available viable tactics or shrinking situational negotiation of how we might play. On paper, it’s even more bland—a mere Serpent Sting buff.
Compare that to the likes of Wildfire Clusters, which while certainly dull, don’t shift priorities. Moreover, while Latent Poison requires a full DoT spread (and generating Focus from SpS ticks would often oblige it even before getting just about anything else rolling) to see its benefits, pushing back competing actions in AoE by multiple GCDs if it pushes back them at all, Wildfire Cluster at most pushes back competing actions by one.
I like Latent Poisons as a talent choice, since I can opt in or out as I please, but a design like its is a poor fit for a baseline unless you want to deliberately design a ramp-centric rot spec.