Talking myself out of a purchase

I’m trying to convince myself I need to get a 500 GB SSD to run as a boot drive on my MacBook Air, which is my “desktop.” I’m not entirely sure how I’m going to convince myself it’s a worthwhile idea, but I’m taking it far along enough to write it out so here goes. The plus would be more boot drive storage, which would mean no more problems updating MacOS and no more consternation about only having 18 gb left on the internal drive. However, just writing eighty-five words about it has talked me out of it. The concern over the low disk space is occasionally warranted, but not worth the cost of the external SSD. Not even with a sale price. With that decision made, now I need to go run OmniDiskSweeper to see what’s eating up my last 20 gb on the internal.