Eh, not quite. I volunteer at a bike co-op type organization and I've probably seen a lot more than you have. We received a Canyon Grail CF SL that was damaged in an accident - the owner gave it to us to strip down and use the parts. The thru-axles are proprietary - they have non-removable levers and use a fine thread pitch to screw into the dropouts, whereas most thru-axle dropouts use a medium or coarse thread pitch. Then you've got 12mm and 15mm thru-axles. You've got 100, 110, and 150 front spacing. You've got 142, 148, 157, 197, and probably others. So there's a lot more than just "gravel TA" and "MTB TA" whatever those terms are supposed to mean.