that's because they have fallen for the propaganda
I don't have any dna/evolv products, but I do have a Smok X Cube II - I don't really feel like I 'fell for the propaganda'... had good experience with my M80 plus, for what I used it for (NOT TC), and liked the feature set and form factor of the XCII... thus far, *I* have been very satisfied with the purchase and the product, and ultimately, that is what matters to me, since I 'voted' with my wallet on this one... ANY mod purchase can be a crap-shoot to a greater or lesser extent - even with something that has great reviews or reputation, you can certainly get a dud... overall, I have had really good experiences with my Sigelei products (have a 100w plus box and a 150w TC box) and my Smok products (m80 plus, X cube II, TFV4 tanks)... I reckon the bottom line is what features are you looking for, what is important to you and your confidence level with a manufacturer (can't say I am overly impressed with responsiveness of Smok CS, but thus far that has not been a deal breaker for me)...
for the OP, in regards to your question, I have not really felt a need to drop the extra $$ on a dna device to date - even though I know several people who use them and really like them - there was nothing in the feature set that made me go "oboy, gots to have it"... in regards to the Smok X Cube II - I got my pre-ordered one for $60... same or lower pricepoint than I am seeing on the Sig 75w TC box - so, yeah, the feature set there was definitely worth it to me (dual batteries means longer life and/or higher wattage potential - not counting the gimmicky features, lol - bluetooth app, LEDs)...