CRAWL allows you to do technical stuff that needs steering…like tight switchbacks. But for something that is straight or mildly curvy, the rougher / technical path, the more the lockers shine. No matter how good CRAWL is (and it is…i am a fanboy of it), it is still reactionary (there must be [tiny bit of] slippage before ECU knows to brake that slipping wheel and shift power to the other wheel on same axle)…while lockers are proactive (full power to both wheels on same axle all the time). And reactionary systems risk losing momentum, which can be vital in a climb…as can be seen in video above.
So, yeah, ideally, having both axle lockers AND CRAWL would be cool. Note that 4runner TRD models have CRAWL and rear locker (it is a part-time 4wd system…so no need for CDL).
But again, LC is not a rock crawler…it is too big & too heavy. While clearances are very good for big SUV, it is not as clean as some other more dedicated off-roader (Rubicon, Bronco). So, CRAWl, in 99% of usage for 99% of LC customers, is plenty capable. I read that CRAWL in LC is actually more “durable” than CRAWL in other Toyotas...in that it can remain active longer before shutting down due to overheating ABS system.
Just my 2 cents.