I don't think summoning was mentioned once in the recent Combat Stream..

This is a very fair point/post! Summoning always has (in my short experience) been kinda left to one side, probably because its more support than core combat; in a similar kinda fashion to Prayer, it's just a seemingly random set of buffs without much tying it together. (Prayer at least has the benefit that you can have multiple active at once / different books, potential to tie prayer bonus in on effectiveness etc) Whereas summoning just sort of exists?

I would love to see it get a redesign to an extent and familiars reworked so we don't just see the same ~5 or so being used and thats it. Ways to level up your familiars to make even the lower level ones relevant could be interesting / add some extra variety to combat.