In my opinion the vanilla talents didn’t even fit the vanilla sinistrope tree apart from the flavor text. As such it’s talents have been replaced with summons and debuffs. Sinistrope now focuses on improving debuffs, spell durations and summons.
Now you can get the basic features with one perk. In vanilla phasmalists had to spend 3 whole perks, before they got any benefit at all. Perks are also less specific, spell magnitude perks in the elemental tree now effect all spells, while perks increasing the magnitude of specific spells were replaced for example. Ideally most perk trees will have something to benefit most builds, without making too many perks that are absolutely essential to a build. Rather than locking you to a specific weapon or spell school, you might simply focus on damage or spell duration for example.
This will alter and/or move most perks to give specialist builds more options and make hybrid builds more reasonable.