A drop-in pitch is not a compromise, it is a different surface entirely

Trays of soil grown offsite and craned into a stadium behave unlike a square rolled in place for decades.

The tray is the whole story. A drop-in pitch is grown in a concrete or steel frame somewhere across the car park, nursed for months under proper light, then lifted in and dropped into a hole in the outfield a few days before play. Everything odd about how it plays follows from that.

Start with the edges. A traditional square sits in continuous soil; water moves sideways and down into the same profile that has been there since the ground was laid. A tray has walls. Drainage is bounded, the soil under it is not the soil around it, and the join between pitch and outfield is a seam rather than a gradient. Bowlers notice at the ends, where the run-up ground and the pitch ground do not settle at the same rate over a long match.

Then depth. Most drop-in blocks are shallower than a mature square. Less soil underneath means less mass to absorb the ball's impact, and the common complaint follows almost automatically. They are quick and true for two days and then they go dead, because the top has nothing beneath it to keep working. The famous cracking that used to produce fourth-innings chaos needs a deep profile to crack into.

I am not against them. Stadiums that host rugby, football, cricket and concerts in the same summer could not exist otherwise, and a shared venue with a drop-in surface is better for the sport than no venue at all. What annoys me is the pretence that they are equivalent. Broadcasters run the same graphics, pundits use the same vocabulary about wearing and turning, and the surface underneath does not obey those rules.

Treat them as their own category. A drop-in record and a traditional-square record are not the same statistic, in the way an indoor sprint time and an outdoor one are not the same time, and everyone in athletics accepts that without fuss.

Here is the part nobody wants to say out loud. Drop-ins are quietly standardising what a pitch is, because the same handful of suppliers grow them, in similar frames, from similar clay. That is convenient for scheduling and terrible for a sport whose best argument has always been that Perth and Galle are not the same game.