I don't do any low cadence drills per se, but I do occasionally ride up steep hills where low cadence and high torque is necessary. My latest discovery is that I have close by a hill which is straight, pretty short, low traffic, and 16.7% average with bits of up to 30%. Ideal for two and something minutes of intense low cadence suffering, even with a compact double and a 11-30 in the rear.

For training strength, I do a bit of occasional weight training, primarily deadlifts and squats. Put a set of weights in my living room, and it probably has much more of an effect than low cadence riding could.

I don't think there's empirical evidence in favour of low cadence drills which I've seen, though. Triathlon coaches often recommend it, but 🤷

I record cadence but just don't think about it, really, let the legs choose what they like. It's typically around 85-ish if going hard or 75ish if going easy.