People have different opinions because they here someone say something and they go with that, thats why you don't have explanations. True reason why
some people wouldn't do it, is because of the light cycle differences preffered by each race of plant.
Are you going to be growing a full 100% Sativa plant? If its just a higher amount of sativa in a hybrid, I wouldn't worry one bit. I have both 95% Sativa strains and some higher indica strains going in the same are and they are doing fine, the sativas
are not towering over my other plants,
View attachment 1244619 as you can see my high sativa haze plants over to the right they are completely in line with the higher indica plants.