Does lower write speed mean better result?
Might be, might be not.
With certain systems say, with external burner and harddrives there may be some problems, buffer under runs for example, that can be cured or at least alleviated with a lower burn speed.
What works for Tom and Dick may not work with Harry.
For me, I find with different good media, Ty etc., it all still depends but, burning at 4X and taking an extra 15 minutes is not worth having skip and freeze problems for Me.
If people tell you to 'lower the burn speed to get a better burn,' that's really more myth now than anything else.
That is just your opinion.
Not in my opinion. Nor many, many others. Burning at 4x for 8x disks works for me that is why I do it.
There are just too many variables in ones computer, in addition to other things people are doing with their computer while burning to have a one size fits all.
I suppose that is why you started your post with generally ie. making a generalization or vaguely speaking.