Maximum output isn't everything. Bashing gear that a lot of members here own is trolling.
Not sure if you are being serious but I don't see him as bashing anything.
Seems to be defending the R3 as a valid product in the lineup.
I'd agree with him based on my usage of the Q150 vs R3, though I don't have experience with the Meta LS50.
The R3 can easily outpace the Q150 in terms of output and reach, I'd have to suspect the same goes for the LS50.
Of course this is not always important but it does make the R3 a very valid slot filler in the KEF lineup.
A nice big monitor vs a small one is sometimes just the ticket before floor standers or for an easier blend with some configurations of subwoofer(s).
Of course I ended up going with a slightly smaller speaker myself so who knows. The Revel M126be came across as slightly more robust, dynamic and powerful despite being only a 2-way and smaller.
I'd love to try a comparison with the LS50 Meta if I can borrow a set somehow, we will see.