I have a standing desk, gamer-style ergo chair, a Lay-Z-boy, a bed, a table and chair outside, and a cafe nearby I'm fond of. The laptop can go to all of those places.

I can't work in bed for hours. But I can for a half hour after lunch, take a nap, then set back up at the desk as I am now.

I lived without a monitor for several years, you get the hang of it. I did have to bump up from 13" to 16" so I can use it without reading glasses for a few more years.

I'm definitely more efficient with more real estate, but not in a way that holds me back most of the time.

I've also trained myself to type on a laptop in a way that's hard to describe but: left hand V to Q, right hand N to P/[, so at a natural angle for my wrists. I've been using a split keyboard for long enough that twisting my wrists to accommodate a narrow keyboard isn't something I was willing to keep doing. This lets me get paragraphs/pages written without pain, whether I'm at the desk or not.