Now, let's go off on a completely unrelated tangent. F.I.R.E. That's right, I just said it, completely unrelated. Now, this is a bit of a hyperbole, since companion was undoubtedly doctored up as a "fun" mechanic, based on the fact that multiple formats that impose restrictions on deckbuilding, Commander chief among them, have proven very popular for various stretches of time. However, by far the most important aspect of the F.I.R.E. design philosophy is lowering the gap in power between rares and lower rarities. Of course I would love it if they tested their shit a bit better too, some of the mistakes of the past years have been glaringly obvious just by glancing sideways at the card in question, but F.I.R.E. is not at fault here, I believe, seeing as we have had problems with design and development mistakes escaping into Standard before War of the Spark (which was the first set fully embracing F.I.R.E.'s principles). Anyway, I applaud this direction of "raising the floor" (to quote a mothership article). Even though they were already raising the floor before F.I.R.E. was a thing in my opinion, I hope they continue to do so, so I can keep including sweet commons and uncommons in my cube.
I think FIRE is an issue if it's what allows for format-warping cards to escape notice at lower rarities in the interest of "fun". I'm talking cards like Veil of Summer or Arcum's Astrolabe where they didn't understand the potential impacts of what could happen in other formats. I don't think it's right to highlight lowering the gap in power level between rares and lower rarities as a positive and ignore the negative that this also means that marquee cards needs to be pushed to sell sets. I think that's exactly what has happened with very pushed rares and mythics in the last year that have had major impacts across formats. There has been a major trend towards printing cards that generate maximum value when played by the active player to avoid the feelbads of being answered by the opponent. I don't think that's good game design at all.
If everything were designed ala Dominaria with stronger than usual uncommons + keeping the power of rares in check things would be fine, but that isn't the case right now.