Why is this not implemented?

[Super]

Not sure exactly what the question is. Aren't the ones on the right just regular flat curves that is put on a 3/4" riser block and not 'sloped'?

I have yet to see any of the 2019 releases yet. Were they the ones that originally were going to have openings between the ties? I do remember you saying that Plarail nixed the idea of the openings because of complaints from the Plarail community's.

Weren't the one piece sloped rails made to replace the original 90 degree sloped rail that could be stacked only with a special bottom piece? (see picture) BTW, I have always wanted sets of those but always lost out when they  (rarely) appear for sale.

I just noticed in this picture something I really hadn't noticed before in those original sloped curves and probably one of the reasons they were replaced. Is that the slope does not transition very well from the rise to a horizontal at the top. It more looks to be just like taking a flat curve on a block pier causing a train to 'bump' every time.