Not at all.

For one non healers can heal just fine, its just costly. Look at Redmage double casting veracures as a dps?
Secondly every time you cast clemency, your not casting holy spirit which is a choice between survival and damage (and guage).
Thirdly, Warriors have amazing self healing that is OGCD and has no other cost, and comes up about every minute or so, more than enough for dungeons and raids.
Fourthly, you are acting like gauge comes up really rapidly compared to 3.0. If you are LUCKy you might get a shelltron off every 30 seconds in 4.0 in shield oath, maybe a little more often in sword oath.

Given you are only level 60, nothing has really changed at all since Heavensward for you, save the cast time going from 2.0 to 1.5, So I can't understand your thought at all. Paladin survivability comes at the cost of GCDS and attack options while the other tanks have it built into their kit.