5e has more than enough save or dies.
And I literally mean it so.
I wish they had been more consistently removing one fail and you are out spells.
5e has all the tools it needs. I think I will sit down and write my own 5e at some point.
Agenda:
- balancing skills and proficiencies.
- balancing spells and saving throws. Changing every suck spell to have more than one save. At least 2 like sleep (a really good change) or 3 (like flesh to stone or contagion)
Spells that damage assume full damage on a hit. If there is a secondary effect, it will be handled as above.
4e had the fantastic idea of using a saving throw as a duration mechanism. 5e should do the same for suck spells.
Regarding tactical thinking. Of course most people were tactical in 3.5e.
4e just gave way more tools to manipulate the battlefield by shift, push, pull and slide effects basically attached to everything.