I've done a lot testing and theorycrafting on Blessed and Thaumaturge. To keep it short, I note two points, which hopefully answers your question:

1. The changes to CP (mainly Thaumaturge and Elemental Expert) might merit you putting your points elsewhere anyway. Some skills like Jabs are getting buffed by Thaumaturge right now (which ZOS indicated is erroneous). Many Templar skills are magic damage, and many are fire; these skills will be buffed by Elemental Expert, and typically this is where you want most of your points, from a damage perspective. Radiant Destruction/Oppression scales from Thaumaturge.

2. Outside of the hardest content in the game currently, predominantly vet Maw, there is very little need for maximum healing potential. If there were reason for your heals to be in absolute tip-top shape, there would be a much stronger need for points into Blessed. I'm speaking very generally here, as there are a lot of factors: a blend between Blessed, Elemental, Erosion, and Elfborn is optimal.

I've done some testing recently (just prior to TG, no testing on this particular concept within the last two weeks or so). I won't bog down your thread with a bunch of numbers, but here is what I recommend for an efficient mix for healing and dps:
100 points Elemental Expert
1 point Spell Erosion
40 points Elfborn
26 point Blessed

I work a lot with hybrid builds, and by this I mean builds that can effectively be different roles by switching gear (i.e. a tank who wants to have a dps spec that can pull 20k+). I do a lot of testing to see what blend of CP and attribute allocations provide the best of both worlds. The reason I've selected 40 points into Elfborn is because it's one of the "step up" points for spell crit. I won't go into detail on that, rather, if you are interested, take a look at this thread. Basically what I've done is found a step-up point lower than the optimal point for dps, and put the difference into Blessed. It allows you to milk the damage potential of Elfborn, while still allowing for increased healing potential where the marginal gains still exceed the marginal cost in terms of CP. This type of CP allocation is very useful for healers who also want to contribute damage, or for tanks who also want to have a damage spec.

TL;DR - Blessed is unnecessary for most content, and is predominantly useful in trials. For almost everything else, you are likely better off putting those points into Elemental Expert or Elfborn for damage.

@failkiwib16_ESO It appears that we are stating the same thing, but if I'm still missing something please let me know. 40 points is one of the step-up points for Elfborn, which is what I suggested. The reason I've chosen 40 points here is because it limits exposure to diminishing returns for both Blessed and Elfborn, so you get the most "bang for your buck" with the limited points you have available for each star.

Thank you for everyone's input. I really do appreciate it.

In dungeons I heal and try to dps when I can with jabs or Radiant Oppression. Also when I'm out questing I use jabs mostly. Autolycus you stated Thaumaturge is boosting jabs but ZOS stated that was not intended. Did they state if this was going to get fixed so Elemental Expert will boost jabs?

Thanks!

Thanks Autolycus for your reply.

I'll move the Blessed points over to Elemental Expert.