The concern is whether the lower serious effects are due to the high rate if previous infections there or just a milder version. Its reason to be hopeful but too early to celebrate yet.
i really appreciate your earlier post about the alpha variant sending its spike proteins throughout the body, more so than the later variants. got me thinking ... after the viral RNA is translated by the ribosomes, the virion is supposed to "automatically self-assemble" - i am guessing the alpha variant wasn't as effective at self assembly, and subsequent variants added some protein "enhancements" to make it more successful at self-assembly. so, that would explain the higher viral load of the later variants - better self-assembly and expression of full virions from the infected cells. and, as Amynamous has stated that covid19 (from earliest variant) causes endothelial damage rather than / more than respiratory damage, this makes sense (?) - to me anyway.