The reason I’m not going for pei or any other spring steel sheet is it isn’t flat and warps with temperature. I’d need to compensate for warping and potentially flatten my bed, which all goes away with glass. Additionally, since I’m on ender 5, the weight doesn’t matter, so that is what I use. Also, for me petg is better than pla in almost every way i use the printer, I care about creeping and temperature stability, which makes petg the absolute king. But for some other use cases, other stuff makes more sense.