Yeah. I don't think I they were affected by normal attack speed as well but it's hard to tell.
Anyway with Synergy Bonus and boost talent, you get minions to have over 70% APS boost and 70% MS boost . Also minion has natural 50% attack speed boost for few second. Then add summon haste legend affix which is added by ruby.
Synergy would go good with momentum and summon + high APS build. Also just for high APS in general. Looks like this gives me a brilliant idea for PvP xD. OP barrage or other skills! I mean it's less powerful in PvP but it would still work. See I get new ideas and learn from people's questions xD. The mythic itself wouldn't be nerfed but the talent would so I wouldn't benefit from that talent called boost as much nor diffusion.
Diffusion gives 30% HP and DMG to minions from yours so if you had high DMG and HP , the minion could take 30% of that at talent 20. Summon HP is of course another way and hero points.
Maybe summoners mythic could be better when minion dies slower for eg.
Btw, skulldraga is treated as a Living minion so that's why A.I can sometimes attack it and get distracted. Also the skulldraga of mine disappeared super quickly against that barrage build since it had limited HP. It's HP increases as I increase my own HP. Mirror image is also treated as a summon minion with its summon DMG % at hero points.
Although summoners mythic probably only affects the minions of the tome. A wizard exclusive mythic if you will. It could affect furies and skulls and stuff but it most likely doesn't.