Interestingly I have never had a home demo of speakers, but have been very happy with the speakers I’ve bought - and in multiple rooms over time.
The first (ignoring home brew predecessors) I auditioned against a dozen other speakers, loved themmat the dealers’, took them home and was absolutely satisfied with my choice. They sounded good in that house, the next, the next, the next, and the next, and then in the home of the person I passed them on to. I replaced them with their bigger brother, simply unaffordable at the original time, but the same character and overall design - and they sounded good in that room, the next, the next, but then NOT the next: it was a problem room, the first non-rectangular. Eventually I got them sounding right, with a complete room rearrangement assisted by REW.
I then inherited some money and decided to get some new speakers (not because there was anything wrong with the old, but with replacement drivers only available secondhand and less commonly available I thought a newer model may be better to last me the next hopefully 30+ years. I took my speakers, huge though they were, together with amp and trundled off to audition 5 other speakers, in each case setting up mine to compare directly in the other rooms, giving we a baseline for comparison. When I got them home the speakers I bought worked well without problem, sounding a bit better than the ones they replaced.
In all that, three different speakers Worked well in a variety of rooms, the only problem being a problem room - and I don’t think any speakers would have worked there without that same major rearrangement. So I am not worried about auditioning at home, though I wouldn’t buy any without hearing first, and accustomed to or satisfied with some other speakers, taking and playing those in thr audition room can give a reference point for assessment.
Whether it is significant that all three of these speakers were transmission lines I have no idea - some people say TLs are less fussy than many in terms of placement, but I havent compared enough to comment.
The first of the above (equivalent new cost today £2.5-£3k) lasted me 15 years, and only changed because their top of the range sibling became available secondhand at a ridiculously low price (but the originals are now back in my house, still sounding good, owned by my son). The second (equivalent new value today about £5-£6k) lasted me about 25 years, only moved on because I came into some money and could.