I would never dream of cutting down a scrim or microfibre, bigger the better so far as I'm concerned, and you will find that the scrim is almost certainly a metre square if you measure it!
Once you have broken it in and used it for a few weeks it soon starts to shrink.
And of course it gradually gets thinner with use too.
I guess some will prefer smaller scrims, but I find they just get damp quicker and you have to keep changing to fresh scrims.
You soon get used to using larger scrims or microfibre, in fact I can't stand the smaller microfibre that Unger do, next to useless in my opinion.
The larger one is superb though.
Regards,
Ian