Somewhat recently Chill touch got an update. It debufs str by -2 up to a max of -6, for each cast that is unsaved.
This moved Chill touch from a never practice spell to a usable spell at 50. Even if a bit niche.
Burning hands (Invokers) and Shocking Graps (BMGs) remain in the never waste a practice in them category.
So I propose 3 different solutions/scenarios:
Solution 1:
Give them to adventurers. It changes nothing except that they become free for converted characters.
At least it could be a nice way to kill stunned players. Like energy drain.
or Solution 2:
Upgrade the spells.
Shocking grasp could damage DEX, like Chill touch damages STR.
Or damage DEX on a non save roll. Just a set percentage value to damage it. Like 33% chance to damage dex by 2 up to a max of 4.
Burning hand could flameblind. Not like flamestrike, but like Path/ray. A double save. If they failed the aff save vs the damage, it would roll another save to try to flame blind.
Or just have 1 save but with 0 hours duration.
or Solution 3:
Alow mages to cast this spells at weapons. Limit it to staffs only. Make the staff have to be not wielded but in inventory to make it harder at L50.
And for the duration of 5 hours, it would auto cast each round the spell in combat.
This would be great for ranking.
and Bonus:
Grant the spell to every CC. Every castable/cc class would have access to these bonus cantrips: chill touch, burning hands, shocking grasp.
When your fights last 8-10 rounds. Burning hands/shocking grasp isn't that a big factors. But its nice vs mobs, if solution 2 or 3 was chosen.