>>We do not guarantee 100% compatibility between major versions.
This is a true caveat for any language or framework, and is a sensible disclaimer.
But I think the author was referring to transition from “.Net Framework 4” series (since 2001 when I first used it, ~23 years ago) where Microsoft declared “.Net Framework 4.8” would be the last major version of that series. And that new developments should use the “.NET Core” series, which is now named just “.NET “.
This is a true caveat for any language or framework, and is a sensible disclaimer.
But I think the author was referring to transition from “.Net Framework 4” series (since 2001 when I first used it, ~23 years ago) where Microsoft declared “.Net Framework 4.8” would be the last major version of that series. And that new developments should use the “.NET Core” series, which is now named just “.NET “.