One aspect of "lightness" is transfer & disk: initial download duration, storage size per app (often over 100 MB for apps with embedded Chromium), and the size

One aspect of "lightness" is transfer & disk: initial download duration, storage size per app (often over 100 MB for apps with embedded Chromium), and the size of each app update which often needs to update the embedded Chromium too, if they're being responsible. There is no "LTS" version of Chromium.