Modify Configuration Re-Deploys already installed software?

Modify Configuration Re-Deploys already installed software?

When we setup a configuration, say called "Base Software" and we add a whole site to it along with a list of packages it works great to get them all installed. But, if we make a change to that configuration i.e. adding or removing a package desktop central is re-installing every package completely which is very undesirable. Is this by design?

Can we not use the configuration as we visioned, "Base Software" that automatically gets applied when a new PC enters the site (the scope of the configuration). ?

Thanks.

Phil

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