Well, the problem is that Pact of the Chain is seriously gimped. There's no reason that a regular wizard couldn't cast Find Familiar in a higher level slot to get a more powerful familiar, and there's no reason that a tome-pact warlock with Book of Ancient Secrets couldn't scribe Find Familiar, so by RAW, the chain-pact warlock is already surplus to requirements. Somebody should put together a table of familiar improvements for higher-slot castings. [Not it!]
Pact of the Chain should have done far more to boost familiars to make it worth taking. Familiars with 7 to 15 hit points aren't too helpful past the low levels. As a DM I kill them often because I feel higher level monsters don't allow small creatures to wander their lairs being well aware that such creatures are a danger.
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