A large part of geometric review is the check of Horizontal and Vertical integrity, being the tangency between curves, maximum deflection/angular change between elements and the detection of gaps.
iTwin DR, being a tool that will be used incrementally along the design development phase, will regularly be reviewing data that in a work-in-progress and have geometric errors that need to be addressed for the next design phase.
In the native design modeling environment (OpenRoads for example) we have geometry integrity check reports that checks the ends of each geometry element to the start of the next one - allowing the reviewer to quickly detect gaps and non-tangencies that will cause issue during site setout, to excessive angular/bearing changes that are geometric non-compliances.
This would be a very valuable addition to the Horizontal and Vertical Geometry reporting currently in iTwin DR and will allow a reviewer to identify issues that are not very apparent visually. Some type of "global" reporting would take this to the next level instead of a individual check.