I think there is a bit more game specific decision making more than just blink is always good on TA. Yes blink is amazing - without a doubt. On TA I think you should be way more discerning of your item choices based on what the enemy lineup/your teams lineup. Phase/Drums/Yasha/Magic Wand/Bottle/ is an amazing early set of items for TA for the gold, outside of heroes with natural escapes (leaps) - you can walk down anyone with the movespeed + trap. You're also tankier, and faster than most heroes.
If the enemy team has silences or has/is building orchid - manta first can really sustain you in teamfights with some offensive stats. You need to know who on the opposing team has refraction stripping skills and who doesn't. Did they build an urn to counter you and are they using charges on you? Do they have heroes with dots?
Refraction is a a 17 second cooldown and lasts for 17 seconds if the instances are not used. A very simple tip is whenever you think you might be jumped, or before you jump in on someone is to precast refraction. Look for the ideal situation, where all the charges of refraction can be used - ideally the cooldown will cycle and you will have twice as many damage instances in a small 15 second window to really walk over the enemy.
Buy blink instead of the yasha, if the enemy has heroes that you can blow up in the current game state or if you need blink to successfully run them down in a chasing scenario. Buy blink if you need to get on a back line hero or to gap close in a way that shuts down an opposition hero. The talk of blink slark sets the stage. Sniper/Drow are heroes that a blink dagger on TA can abuse - and that you might need to abuse them. If magic damage really is an overwhelming issue - work the bkb in earlier. Blink can also be the overwhelmingly right choice if your team lacks a legitimate initiator or if you need to stay out of some big AOES and position yourself on the flanks or from behind as a teamfight breaks out.
The hero is really flexibile and with proper item choice gets way stronger. A great deal of TA play mid in the pro scene also revolves around midas first as well.