I've found much the reverse. Armor saves are more important than ever, because anything that protects your valuable Troops from the large amount of small arms fire in this edition is worth it. One of the big strengths of Tau is that their Fire Warriors have 4+ armor saves instead of 5+, and are thus much more resilient to bolters, Thunderfire Cannons, Serpent Shields, etc. than Imperial Guard or Eldar.
In 5th edition, armor mattered a lot less than it does now because practically everyone had 4+ cover all the time and could go to ground for a 3+. 4+ armor in particular was almost worthless and usually carried a cost premium to boot. Luckily, cover saves are now somewhat harder to get and much easier to deny, making armor saves more important and valuable.
The exception is that nearly every unit that has a 2+ armor save is also expensive enough per-model that the 2+ save isn't really doing that much to protect them. For instance, for one TH/SS Terminator with 2+/3++ armor, I could instead have 3 Tactical Marines with 3+ armor. The Tactical Marines are more resilient against both small arms and AP 1/2 shooting, given the existence of cover.
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