There needs to be some adjustments with fending accessories

[Firepower]

I must agree with this, VIT accessories are the only ones in the entire game that are completely outclassed when gearing up. All other jobs progress in item levels through their accessories and the only reason people get pentamelded crafted accessories is to add VIT for the first timers and ultra hardcore that need the extra HP to survive major attacks. When the most optimal path of gearing a tank is to completely ignore ALL fending accessories and start with melded accs and then convert to higher item level STR accessories simply because the higher item level left side gear then makes up the VIT deficiency and the VIT accessories just bloat out the HP pool without any extra gain.

There are multiple ways of fixing this but all have drawbacks.

You could just add STR directly to tank accessories and then make them Tank only (so not to destroy STR accessories) The drawbacks of this mean that crafters will no longer need to supply any tank based materia melded equipment because the standard gear will now have STR+VIT but there will still be demand for jewellery for DPS and healers that need the VIT.

Changing tanks to VIT based damage - This could potentially make the Tank class slightly overpowered in a case where it can stack a substantial amount of VIT and produce respectable DPS, leading to parties of multiple tanks and a few healers to cruise through content that don't have extra hard DPS checks and outdated content.

Force tanks to be unable to wear STR accessories - This would work well in crafters favour as the materia melded accessories would then be the best, drawbacks being the tank class then lacks choice and could cause enmity and DPS problems later on when the damage added by str/dex etc.. accessories give the DPS classes a much higher damage output than the tank.

Develop new content that encourages the use of VIT accessories - this is problematic simply because it also ramps up the item level entry for tanks immensely, if right side vit accessories are required to survive a big hit then you are likely to need a significant amount of gear for the left side too. Then it just falls to the same issue later on, when the left side gear provides adequate VIT for the content the right side will change to STR for optimising DPS.

Finally the last option would be to add Defence or damage reduction on VIT accessories making them much more appealing this is unlikely to fix anything since soon as it is not needed STR gear will come out again and then you revert back to the last point where if you are forced to create content to force the use of the accessories then it makes the gearing burden on tanks hardest.

Personally I think adding STR to VIT accessories is the least intrusive method of fixing them and you could easily compensate by upping the DPS checks by the equivalent % of damage that STR accessories add to the tank if they are factoring in tank DPS as part of the check.