In D&D 3.5e, blasting was known to be a comparatively weak strategy for a Wizard to adopt. On the other hand, in D&D 5e, there have been a number of changes that potentially render it more effective, for example:
- The numbers on blasting spells have been adjusted.
- Spell resistance has been changed to 100% chance for 50% damage instead of ~50% chance of 0% damage.
- Summoning and polymorph options have been severely limited.
- Specialising in Evocation gives strong benefits to blasting spells.
So, is blasting a suboptimal strategy for a D&D 5e Wizard? A good answer will be able to objectively demonstrate that this is or is not the case compared to 3.5e, or that something else is different between the two editions which alters the situation.