That's what Storm was saying about i. Rounds. If he doesn't own the Brits, then he's most likely never played them at all
Of course he never played them. How could he if he does not own them?
This does not mean that you could not spot that something is wrong with a faction or single units. You should be more considerate and open minded since it is in general harder to get a decently based opinion on a unit, but not impossible. You still get a feel for raw performance, timing and general strength against that faction. And while there are obviously some things missing, this can be enough to have reasonable balance concerns.
I would not phrase an opening post as absolute like OP did, but people were RE-ing against the general fact that somebody talks about a unit he did not buy, which in my eyes is absolutely wrong.
What I said is that I have not seen enough IS yet to have a personal final opinion. But in general it is nice to see Brits being played again, they were quite rare in 2v2 and 1v1 before the recent patch.