These are wearing your SSD down.
And no, they will not be combined together because most of these shitty apps have O_DIRECT flag set or call fsync() after each write(), making the OS obligated to hit SSD with 4kb write.
SSD's don't operate that way, though, a 4kb write is guaranteed to become a bigger write since SSD cell/block is usually either 512kb, or 1mb, or 2mb, or hell even 4mb. So one 4kb per second becomes 4mb per second, and that's 345.6GB/day.
Pretty scary how one shitty app can ruin your ssd so fast, huh? I saw google drive app do 50 small writes per second. That's ~2TB/day.