The ancient Summoning update with archeology basically introduced familiars at random levels because they couldn't fit in properly with 99.
For example the Ripper demon (96) is stronger than the steel titan (99) when they've probably should have been swapped.
There's room to fit more skilling summons. The beaver is best in slot for woodcutting but it's very low in the skill guide and doesn't even last a full hour.
External link →