So, back when I played RO2 in 2014 I never reached level 50, so I was never able to tell how effective certain jobs in RO2 were back before the "renewal"[AoV]; however, after reaching joblevel 50 on my Alchemist, I had to realize that there are basically 2 things making the jobsystem really inconvenient:
1: the joblevel does not progress past level 50, even if you advance onto master combat profession level.
That by itself is not a real problem, but it sure is kinda strange that you can't craft Master level equipment unless you reach at least combat profession level 50. So, you have to advance in both combat and job profession level to at least level 50 unless you can craft master gear.
2: of the 4 base jobs [Alchemist,Chef,Blacksmith and Artisan], only Blacksmith and Artisan are relevant for endgame purposes. That is because potions and foods are dirt cheap on the market in contrast to crafted equipment as well as not really required for most Classes/party setups [unless the equipment sucks] since there is always the alternative from the potion merchant that's sufficient for leveling/farming.
Also, if we consider the effects of equipment level 50+, since the foods&pots don't have any %boost, they contribute little to nothing to your overall stats [don't forget Vulcans Blessing& Balials Blessing from Artisan&Blacksmith grant% boosts!!!] when your equipment gets better&better.
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So, to counter this problem I have two suggestions to make:
1.: To make all jobs equally useful in late game progression, how about granting an 1% boost of job-specific item effectiveness per joblevel? This would boost the recovery rate of potions for Alchemists and foods for Chefs by up to 50% and the buff duration and effect of buff potions/foods by up to 50% as well when you master your Alchemist/Chef job.
Blacksmith and Artisan would also profit from an increased %-rate and duration of Vulcans/Balials Blessing if they master their specific jobs.
By adding this passive boost, Alchemist and Chef can become relevant jobs even when progressing till endgame, and are a solid choice for every Class, not just some tool for easy jobprogression untill you change to Artisan/Blacksmith at max joblevel to skip the hard leveling experience on these jobs.
For the potion recovery effect: Note that this boost has to be multiplicative with the VIT boost to be relevant, if it's just additive it would provide the same effect as having additional 250 VIT...
2.: change the formulas of the master grade & dayr buff foods&buff potions to include a percentage boost (it can be really low like 2-3% and still provide a great improvement in their overall performance); this has low priority compared to suggestion 1
