For a while now the transition away from Manifest V2 (MV2) to MV3 has been on-going and it looks like it is entering its final phase of deprecation, at least, in the case of Google Chrome. A recent discussion thread in the w3c WebExtensions Community Group GitHub repo has highlighted how the latest and upcoming versions of the most popular browser are expected to be its final releases with support for MV2 extensions.
What this essentially means is that the tricks and bypasses that were used to keep MV2 extensions like uBlock Origin and others alive will not work any more on Chrome, or at least not for very long. For example the Windows Registry mod that could extend MV2 availability will cease to function after Chromium version 151.
uBlock created an entirely different implementation of their extension to work around as much of the bullshit lockdown that MV3 implements.
Adguard (and ublock origin “lite”) work exactly as much(or little) as google thinks it can get away with right now.
MV2 VS MV3 is much more of a change than just the stuff relating to ad blockers, but that doesn’t detract from the fact that a company that makes a large proportion of their revenue through advertising was in full control of the specifications for the “new” MV.