@WillC thanks for reaching out!
I based my diagnosis on Google images for thrips which looks and reads exactly as I see on the plants. I know it's difficult sometimes to convey in photos.
I see the yellowish/whitish larval, I guess, stage and occasionally a blackish adult-looking guy. Especially on the spider plants and the syngonium, I continue to see them obviously on the leaves even just after spraying with the insecticidal soap.
The other plants I didn't notice blatant damage, but I had moved those infected plants near them before I noticed the bugs, so I inspected them and saw insects.
It's definitely not aphids. I've had them before, too, and am familiar with observing them in the garden.