Xpresso is hands down the single most important tool in all of Cinema 4D. Take it away and Cinema is nothing. There was talk of the new nodes eventually replacing it and Maxon considering Xpresso to be archaic and unworthy of further development efforts beyond basic maintenance, but that has since proved to be fantasy. Nodes are languishing and stuck in a perpetual technology preview stage with barely anyone enthralled by or enthusiastic about their future. That leaves Xpresso as the still undisputed king of Cinema, but since it isn't being actively developed there isn't much incentive for people to write about or promote it beyond the substantial and already available content on YouTube and elsewhere.