Just a bit of a brainstorming.
Some more modern games (Supcom series, Wargame / Steel division) have artillery with extremely long range, as in they fire across all but the largest maps.
Just thinking what if Planetfall introduces similar units instead of highly annoying strategic spells.
We actually discussed several versions of this idea - i.e. a spellcasting alternative wired through units on the map.
A big issue here is that as soon as you have a few of these units on the map you get what we'd call Venn diagram soup. I.e. lots over overlapping circles to define what can reach where..
What makes this worse if the information each of these needs to carry: ownership, what the ability/attack is and what it can do, possibly the state of this ability, etc. Especially when trying to move into an area covered by multiple of these ranged enemy units. At a point it becomes hard to see the fun through the information overload.
There's lots more detail here, but I'll leave it at this to avoid those dreaded walls-of-text.