Neonchameleon
Legend
Because there's a huge difference between adding 90ft to a spell with a 10ft range and adding 90ft to a 120ft range. Some spells are intended to be close range. A spell like Eldritch Blast that's already long range doesn't change much.Sure, but that gets back to the question.
What was wrong with a sorcerer being able to distant spell any spell to increase their range by +30 per level? If we can assume the sorcerer ability is fine, than that distance and applying it to cantrips is fine, but I see no reason it couldn't be applied by sorcerers to their metamagic to make it a viable choice.
Picking an obvious case that would change drastically Teleport has a range of 10ft - and the caster and up to 8 willing creatures within range can be teleported. The current version Distant Spell on Teleport turns it into up to 8 willing creatures within 20ft - which is sometimes better but not a change in kind. If you were to use the +30ft/level range and have a 13th level caster cast Teleport it now has a range of 400ft. You basically just need line of sight to pull everyone out unless there's a whole lot of anti-teleport magic.