I’ve just discovered that a partial simplification occured back in May with fares on the Merstham to Gatwick section. Originally Govia (backed by the DfT) had mandated that fares avoiding zone 1 should often be more expensive than the equivalent via zone 1 fare. This had the particularly nasty side effect that sometimes touching a pink reader (eg at Surrey Quays) might charge more than if you didn’t bother. That definitely contradicts the message TfL want to make about pink readers.
However, since May these fares have been revised downwards to the same level as the via zone 1 fare. One can only guess which side was the driving force behind this change, and I don’t think it was either Govia or the DfT. Better late than never, and a shame no announcement was made, from either side.
The opportunity to save money on most fares by splitting at East Croydon still exists though.