i think that the Tautline fits in several ways, and is more dependable next year than the same manilla line in use right now.
i think it suits emergency/ other non-split tail category. Blake's would beat it here;
But, then; a tautline has historical roots in writings, generations, virtually any climber around; linking, recognizing and reaching acceptance with all those factions. Important for a learning climber i would think, especially a roaaming or exploring one.
But, still more; as liken the mountaineer's family of 8's knottings, for quick familiarity of one principle and identifying charachteristics for immediate spot checking.
Not quite as frequently as hearing a bowline called the 'King of Knots'; i've heard the clove as the 'Mother of All Knots'. As, so it seems here in this tree climbing family of knots.
For, a clove (1|1)is it's own hitching, half is a preceding half hitch. A double clove (2|2); a tautline, a 4|1 attatching both ends- a distel. A clove (1|1) back to the line itself to form an eye; a buntline.
In it's simpler forms, (clove, tautline etc.) it walks and must be secured, until other factors than a seperate stoppper knot takes over that function. Also pulling on 1 end pushes the 'Z' bar towards the other end (that might be free), and also the pulled end tracks against the other end and tries to pull it out also, seeing as they are faced in opposite directions, i think.
This lacing family all continue in the same direction once the coils are started, they all pinch the 2 ends together between the tightening coils type engineering scheme, thus having an idenitfying 'Z' bar.
A 1|2 forms a utility friction hitch called a rolling/magnus hitch. Self trapping the tail on a 1|1 clove forms a constrictor. etc. Slipped configurations are easily possible too.
In fact, the other day, the only way i could get my buddy to see the knut positively, was to show him an inverted distel (1|4), loosen the top ring and force it down the column and set it around the other tail and host line under the coils. Then he saw how it fit this 'Z' bar family, and always rememberded to continue the lacing always around in the same direction from that.
So, given the acceptance, refrence, minimal gear need, historical placement, and placement in a comprehensive, single concept family of knots, it is definietely a keeper. i also think that the background, and really less learning from this aspect, and more exercised speeed and familiarity with every knot in the family at once for most 'leveraged' learning of 1 common principle/action done well repeatedly.
But, that would be to climber/rigger non-recreational. i can definitely see other cases in recreational field for quick, fun and confidence.
Just making a case for deeper, easier familiarity in that daily type climbing, and the humble tautlines pro-posed place in that class. And that with a comprehensive view of the basic lacing style, would be about nothing to learn the tautline, and any lesson learned in it so immediately, wide spread upgrading of familiarity with all in it's family at once.