The material can survive a quick clearing
Grease, scale, roots, wipes, and settled debris behave differently. Creating a small opening can restore temporary flow without removing the condition that caused the blockage.
Describe what comes back, how long the relief lasts, and what cleaning method was used before.
The pipe can be the recurring condition
A displaced joint, sag, rough interior, root entry point, or damaged section can collect material again. That possibility becomes more relevant when the same line blocks repeatedly.
A recurring drain does not automatically require replacement, but it does justify moving beyond identical clearing attempts.
Escalate the evidence, not the sales pitch
Map the affected fixtures, review the cleaning history, and choose inspection when the answer could change the repair decision. A camera is useful only when access and line condition allow it to answer a real question.