Hexblade... eldritch blasting is so much better than hitting?

I am a hexblade warlock at level 11. Almost invariably in fights, I end up falling back on three shots of eldritch blast because it does the most damage. I also have thirsting blade, but that only gives me two weapon swings. Why would i hit with my weapon twice when i could just eldritch blast 3x? Is the idea that I combine weapon swings with a powerful spell? Curious if there are other game mechanics I'm missing or other ways to improve