It's such a mess though.
If you got lv 50 LNC, i would make sense for DRG to be lv 50 also, since DRG use spear also; you should know how to fight with a spear, from being a LNC previously. It's fine if Job progression start at 30, but it should be spaced out less, so you can unlock a new skill every 3 lv, instead of 5; so you can fit in more Job skills by 50. Jobs are advanced classes, so it wouldn't be appropriate if it started earlier, and learning lower lv skills. Job skills should all be 30+

Well since people are mostly complaining about WHM and BLM, that WHM should be restricted from using elemental skills...what would DRG be restricted from using from LNC? or is the problem only in the skill sets of CNJ, THM, BLM?
It would be nice if classes didn't become Obsolete though, after capping a job...