Yodhrin was 100% correct. Some people like to address the scale and
proportion problems. If you don't want to do it, then nobody is forcing you to. But nothing is ending up "bigger than they should be". Who's to say what something "should be"? Obviously not you.
"What something should be."
How it "should be made" which is unmodified? It is a valid statement.
How it "should be in scale" according to fluff I can see wanting to make the change. It is also a valid statement.
"True scale" is a bit of a misnomer since all the models are already "heroic proportioned" for better game piece durability and easier to see the detail in a bigger size: they cannot be true to scale at all without looking wrong. It is not the "true" scale here.
Maybe we are looking for "proportionately scaled up"... hehehe... "supersized", "right-sized", "correct-sized"... this is sounding like a political correctness speech for layoffs.
I have met too many people on this board who will fight you tooth and nail that 6mm vs 10mm figures are VERY different and not "good enough" to be used either way.
Being more of a devil's advocate, in the end, the bigger marines look cool.
I would be happy to see them across the table, I would just look at them and say "Challenge accepted: the bigger they are, the harder they fall!"