Thinking of making a custom map editor

Hi all!

I'm thinking of building an open-source 2D map editor for map builders, game devs, level designers etc.

I've used a few general-purpose map editors, and they often felt clunky or slowed down the workflow. I'm planning to make something that's fast (as in making a map feels fast), and focused on actually building levels.

Some things I'm curious about before i begin my marvelous journey:

* What feels unnecessarily complicated in current tools?
* Are there any features you wish every editor had?
* What would make you switch from the editor you currently use (if any that is ;-;)?

I'm trying to gather other peoples perspectives aswell... so yea.

Thanks!