What size multi-tool should I get for backpacking versus car camping?

Across multitool communities the rough consensus is: under 5 oz keychain or Swiss Army-style tools for weight-conscious backpacking; mid-size 8-9 oz plier multitools for general camping; and 12+ oz heavy-duty tools like the Surge or Super Tool 300 only if you're car camping, doing trail maintenance, or want it for work as well.