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>> I simply conducted a small experiment and PG analyze clearly showed a missing index in one of the key tables.

Based on this sentence, I interpreted that part as representing that the engineers did not believe the missing index was causing the problem (until the experiment was run).

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Yes, one of the theory was that the index wasn't the problem because there was already a multi column index on that particular column. However the PG analyze tool showed some particular query didn't utilize the index, so there needed to be a separate index just for that particular column.

The number of reasons why an RDBMS - especially Postgres - can choose to not use an index is wide. Sometimes it’s your fault, sometimes it’s the table statistics fault.

Good on you for actually empirically determining reality.

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