I was about to say the same thing, especially how playing unplugged reinforces a heavy touch. Do it enough (just like grooving a tennis stroke or a golf stroke) and you train yourself to consistently have a heavy touch. Not my cup of tea.
I couldn't disagree more. I only rehearse unplugged. When I was young, my parents worked nights. If I woke them during the day? No one was happy. Playing thru an amp was not possible. But I played hours a day, regardless.
Massive ear training benefits. Makes you flex your listening muscles to the extreme. I learn and rehearse tunes this way to this day. I pickup my bass for fun or work in any house, at any time, during a day or night and no roommates, wives, kids or neighbors ever get disturbed.
And, as most pros know, dynamics are a rudimentary part of both getting, and keeping, positions in bands or recording. Despite my 35 year habit of playing unplugged 90 percent of the time, my hands are mine. I control them. I play soft. I play hard. Anytime I like. And I gig consistently. That wouldn't happen if I weren't dutifully aware, and in control, of every facet and aspect of my playing, whether I am plugged in or not.
As far as buying a bass guitar for its unplugged response? Absolutely I consider that. After decades of playing, unplugged, there are facets of a bass' response and tone, two independent factors, that I can tell right away, long before I plug a bass guitar in to an amp. Deadspots. Sustain. Transfer of string vibration to the body, neck, headstock. When I buy a bass, I want it's plugged in tone to resemble its acoustic response. I don't want electronics making up for weaknesses in woods (spalt and burled tops, for example, are a whole lotta filler without much straight grain. Terrible woods to provide the response I seek in an instrument).
Regardless of one's beliefs, I go with what I hear. Unplugged. My bass guitars sound exactly the same unplugged as plugged in. It is what I look for. The physical benefits; strength of hearing, strength of hands, as in, I don't tire after 8hrs on an outdoor stage with multiple acts in 105 degree heat or 20 degree cold (both done lots), and just the fact I know my instrument. Inside and out. I can play gigs with no monitors, no in ears, no amp. Easily. With no fear of losing "My Sound". I can feel everything without need to worry. Rattles, buzzes, are apparent. More easily isolated. Too many benefits to rehearsing, practicing, unplugged, for me. Up to, and including, not upsetting my parents', neighbors', kids', wives', sleep. I'm better, by far, for having played unplugged.