I don't believe in this in general. Beeing a stringer (for consistency doubts) and tried out more than 25 different strings from various brands (Adidas, Apacs, Gosen, Li-Ning, Oliver, Victor, Ashaway and Yonex) I simply landed always after a short time at my go-to and what I was used to. Used in 8 different models from the Big 3 over the time.
I personally think that the choice of the racket (how demanding it is for the player) become with a hard feeling string, too high strung tension even more demanding and this leads to the conclusion that this combination don't work for a specific player with certain types of strings. Demanding+Demanding+ Demanding equals too demanding That every user of racket X should lean towards string Y is IMO not true. I think it really depends where the racket choice sits.
Most people I string for choose price and durability over performance and many people play rackets which tell me on their low request are too demanding for them in terms of stiff. So many tennis elbows, golfers elbows, shoulder issues...
On the other hand there are also players who string too high, so slightly lowering by 1-2 lbs would give them better performance, but they fear the tension loss and overclock. I see it that way: A bread fresh out the oven tastes best. Why should I take a peak performance in 4-5 weeks as reference? I cut my own rackets when they got 20-25 hours of play and I want a short break in period.
All in all I think there is a window from easy to use to very demanding for rackets and same for strings and also a personal window for tension from too low, right and too high which can be very personal. If people choose very demanding rackets, just a very few can handle an demanding string in combination with high tension, it will more likely that this will not work, but you can adjust three screws. The racket, the tension and the string.
A player who uses a very easy racket can go with some reserves more for demanding strings and higher tension. What's easy and demanding is very personal, also the choice of tension.
I always dislike every demo racket but not just because of the string or tension just because most grips where to thick for my liking and this influence the feel of the racket even to the same amount, maybe even more.