I can't buy that not using this simple piece of equipment is going to drastically increase one's focus. I'd be very unfocused if I was trying to replay 5-6 pitches in my head to regain the lost count.
I use an indicator, but rarely look down at it. I cut notches in the wheels for balls/strikes, so that I can read the count with thumb and index finger. For me, having the count on my fingertips allows me freedom to focus on other matters.
If going without a net works for you, great. But I don't think that going without using this simple piece of equipment needs to be encouraged.
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