Consolidation loses more than it gains when the merge destroys signal or blurs intent instead of absorbing it. The optimistic story is that combining two pages concentrates their strength into one, but that only holds if the merged page actually preserves what each original earned and keeps serving each audience. When it doesn’t, you are not concentrating value, you are deleting it, and the redirect quietly carries the loss forward.
The most common failure is dropping the coverage the weaker page ranked for. Each page earns its rankings by answering specific queries with specific content. If the merge keeps the stronger page’s material and treats the weaker page as disposable, the queries that depended on the discarded sections have nothing left to match, so those rankings vanish. The redirect points somewhere, but the destination no longer answers what the searcher was looking for, and Google has no reason to keep ranking it for that intent.
A bad redirect or a poorly chosen survivor URL adds a second way to bleed value. If the lower-equity URL is kept and the stronger one redirected, you route your best signals through the lossy step on purpose. If the redirect is a soft 302, a chain, or points to the wrong place, the equity it should pass arrives weakened or not at all. In both cases the page that survives ends up holding less authority than the two pages did separately.
The third failure is intent, not signal. Two pages sometimes exist because they serve two genuinely distinct intents, and forcing them onto one page produces something that serves neither well. The merged page tries to be both and ends up diffuse, so Google sees a weaker match for each query than the focused originals were. To avoid all three, before you merge, confirm the surviving page fully absorbs both intents, check that the higher-equity URL is the one kept, and verify the redirect is a single clean 301 to the right destination.