I'm not really too sure how to take it other than Tanks will have a lot more HP and won't be wearing pure DPS accessories.

Look at the case of Melded Accessories, even if STR scales at half of VIT.

i150 Crafted with Penta Melds would be almost as strong as i210 (44 ATK VS 47 ATK) - just less HP.

i180 Crafted fully melded for STR -> 54 ATK equivalent.

So stronger than i220 but not as strong as i230 (other than the difference in HP)

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So depending on how much STR will still effect damage, you may find that while tanks wont be stacking DPS accessories, the crafted accessories will be even stronger than they were.