While it may sound odd to want new pixel art to be "authentic" in the same way as new music should respect the structure and form of styles like ragtime, blues or jazz, I think it applies equally. The skilled artists who hand-crafted pixels to look their best on CRTs did specific things to leverage CRT bloom and blending, scanlines, composite color artifacting and interlace dithering.
What are "CRT bloom and blending"? Are you referring to artifacts caused by composite video output? That is not due to the CRT but rather the signal distortion. RGB output on a CRT will look pixel perfect and colors will not merge. I'd say most gamers using original hardware on CRTs these days are using RGB, so if anything, it reflects the current user trends if the Earthion designer did not use dithering (which he did, making this comment irrelevant).
It's ok to pine for the old techniques, but this is a game made for a Genesis in modern times. It has to stride both.
By the way, some of my favorite games on Megadrive are homebrews, most notably Astebros and other Neofid games.