[Flex] - [gap based spacer on the flex layout should be the default]

Please don't introduce one more option for the users to change flex's behavior.

The internals of how spacing is implemented is totally not interesting for the consumers, it's a Patternfly implementation detail. Using flex gap is an enhancement over the old margin based implementation (see RTL) and should be pushed/forced as change and not let in the consumers preference .

I do not understand/support the idea of making it a opt-in as this approach with opt ins just pollutes the codebase of the consumers.

So I encourage you to drop the old margin based solution and adopt as default the gap based.

After all v5 is a breaking release and it should be accomodating such breaking changes which will improve the underlying products. Otherwise, I doubt that anyone would care to switch to adding these new modifer opt-in classes for gap spacing, thus getting stuck with the v4 suboptimal implentation.

The issue points to the Flex spacing implementation in PatternFly's core HTML/CSS/SCSS code, contrasting the existing margin-based behavior with flex gap and RTL handling. Start by locating that implementation and any opt-in modifier classes; done means gap spacing is the default and the old margin-based option is no longer required, with RTL behavior preserved.