It would mean alot, it mean your job with be inherently safe and never truly a bad pick. you could being a BLM to prog and still actually prog by different means. RDM raise adds a defensive cushion that gets worse over time. BLM would have an offensive cushion which doesn't get worse. so even if you don't speed kill, your job is still effectove at all levels except for ultimate where raise matters alot more due to the length, repetition, and difficulty. BLM had the most clears of this raid tier as early as week 3 and that speaks to raise not meaning much in savage progression. tl;dr, the savage content is too easy for the BLM to truly be a hinderance unless you're aiming for world first and RDM raise isn't as valuable outside of that uber niche scenario. so when you say "Black mage would still be good in speedkills doesn't mean much if we're not speedkilling" It actually means your job will always be desired as a saftey net pick. This was NIN prior to 5.0
it's pretty easy to be good any job if you're disciplined enough to learn. you work 72 hours a week. Imagine working 60 hours inbetween, going to school and pursuing an education to further my future. please stop talking when you don't even know what you're talking about.
as far as difficulty and meta relevance, i played AST to great success in alphascape so if you truly believe the only reason my parses are good because nobody is playing RDM
https://www.fflogs.com/character/id/...ec=Astrologian here you go.