I've made a fair few short critical comments about the pitches recently, so time for a longer one.
I don't agree for the alleged wonders of flat pitches - India and Pakistan had very flat pitches in the fifties and sixties and their batsmen were renowned for following the moving ball. They can create hard handed, push at the ball techniques. But I think it is true to say that test pitches in general are generally less supportive of seam movement. England and some pitches in SA and NZ are the only places where this tends to be less true. And
@social's point about modern techniques is also true.
The Shield pitches I see are flat and easy-paced to genuinely slow, or distinctly green, and vary from fast to slow but rarely giving the batsmen the opportunity to play through the line confidently. As
@TheJediBrah says there needs to be a happy medium. The 'traditional' Australian pitch has true bounce, but plenty of it, and a little bit of movement for the better bowlers. Hence batsmen could play time but more accurate bowlers who could nibble the ball could take wickets.
The one thing I don't, in my opinion, see is fairly flat but fast and bouncy pitches that reward a bowler who is faster or has better finger work to create movement, but let the batsmen trust their shots and punish less accurate bowlers. Instead it's green tops that reward trundlers and make opening very difficult, or Junction Oval style roads that don't challenge the batsmen at all. I'm not sure what happened to the art of preparing that sort of pitch. They could at least cut the grass a bit more, combined with a bit more rolling, but without overdoing it and turning it into the concrete surfaces we see in recent Sydney test matches. The odd pitch which turns would also be nice. Force each team to pick two spinners at least once a season.
The other aspect is that the pitches now seem to be more homogenous, particularly since the WACA went flat and they relayed the SCG and stopped scalping it. More variety is needed. I don't think the use of out grounds is helping either, their surfaces generally seem to be slower.