You people complaining about STR tanks give me cancer. Just so you know, VIT does not decrease the amount of damage we take, it only inflates our HP pool, and being full VIT is not necessary at all to survive. It's in fact completely useless and makes the fight take longer. Damage are reduced by using correctly our defensive abilities. If the damages a tank takes are superior to the healer's healing output, he will die no matter if he has 13k HP or 17k. He will just last 2 more seconds. It's a fact. Having a huge chunk of VIT is only useful in the case an enemy has a really big tank buster ability, big enough to still one shot the tank even with defensive CDs on, which still doesn't exist in this game.

I myself play all 3 tanks at 60 (and cleared all of ARR's endgame as both WAR and PLD) with 3 STR accessories and 2 VIT accessories most of the time, with all STR in attribute points. At i184 I have 15k HP on party (out of Defiance for WAR), which is plenty enough to tank everything in this game and having absolutely no healer complaining about me being squishy and stuff.
For expert dungeons I even go full STR and I have something like 13k. I never, NEVER had any healer complaining. I even often get complimented about fast and smooth runs with absolutely no issues.

Having STR on a tank does so much more than VIT. A STR or at least hybrid tank can deal a really high amount of damage (often as much as the majority of the DPS you can meet in the duty finder, sometimes even more lol), while self healing a lot more than a full VIT tank. So a STR tank does not only have MOAR DEEPZ but also more self-healing. You'll say "Self healing is useless if you don't even survive the attacks first" which is completely true. The fact is that a good tank does not need to have a big HP pool to survive everything. Heck even with my 13k HP full STR build in expert dungeons on really big pulls, by using my defensive CDs correctly and dealing a lot of damage while self-healing, my healer is most of the time DPSing, rendering the fights even shorter. (as full STR WAR, I often do a huge pull, build my agro, build 5 stacks of wrath, activate bloodbath and all my defensive CDs, switch to Deliverance, Berserk, Decimate, Infuriate, Decimate, spam Overpower a bit and everything is dead because the WHM was even able to holybomb at the same time, litterally burning everything)

I would say that in good hands, STR tanks are really, really good and the most efficient. But it has to be played at 100% of the job's capabilities. If you are struggling with keeping a STR tank alive, it's just because he doesn't use all of his job's defensive potential, and this kind of tank, even full VIT, will be a pain to heal.
If as a tank, you find yourself in need to equip a full VIT build, you either are bad at tanking or simply lack confidence in yourself (and/or your healer) and should definitely try to get rid of your VIT jewelry progressively piece by piece to get used to it, if you are a good tank, you'll find out that you benefit more from STR than VIT.

I was myself using crafted i110 STR jewelry with VIT meldings on my tanks before the expansion, now I have both VIT and STR sets at i180 and I mix and match depending on what I do. ATM I find that 15k HP is the "safety cap" to easily survive everything as main tank (in current ex primals and Alex NM, we'll see for savage) so I recommend to wear 3 slaying 2 fending.