OK, esp. since it's not the leading sense of 王道.

As it's quite common and limited to one sense of 王道, I'm inclined to let this one through.

@@ -14,0 +15,2 @@
+<gloss>orthodox</gloss>
+<gloss>proper</gloss>

Said "euphemistic", meant "idiomatic". Sorry about that.

This term is euphemistic("royal road").  One would never guess from 王道 that there was a 的 form, and one would never guess that 王道的 is limited specifically to sense[3] of 王道. If you see 王道的 in a text, you'll have to puzzle about which sense it is. 34608 ngrams seems common enough to me that this clarity would be useful.

王道	1187338
王道的	34608

You can append 的 to a vast number of terms. We don't usually include XX的 compounds unless there is a good reason. This one doesn't really seem needed.