This all sounds like the OP doesn't get the basis of the job - just reading through this thread, they've been given some sound advice on how to deal with the mobility issue (as lack of mobility being traded for raw dps is kinda the identity of BLMs) and they start getting incredibly defensive over it and rejecting the idea of it. Doesn't like like a job for the OP is they cannot deal with the concept that has helped every good BLM from ARR to SB - knowing the fight well enough to know when's a good time to do certain things. I saw a post mentioned about how other DPS have an advantage - but that's not true. The ones with the advantage are the players who know how to perform their jobs with the least drawbacks.

OP, if you're having issues with mobility, just look up a guide as you continue leveling. BLMs are top-tier damage dealers without all the complication that a job like SMN brings to the table.