I did some tests (about a year ago). If I remember correctly, my laptop with 8 GB RAM wrote almost 5 TB to disk during IBD. That's a fraction of what a modern SSD can handle.
In my other test, with 32 GB RAM and enough dbcache on a server with HDD, the disk speed was not a problem at all. More RAM can make up for a slower disk, problems arise when your disk is slow and you don't have enough RAM.
What settings did you use for the full disk encryption settings? what Linux distribution did you use? In principle I will be using whatever debian latest version uses for full disk encryption which I assume to be enough, if not then please someone recommend some tweaked settings that make sense given the context that:
1) You must be running a node, so it will be a lot of i/o
2) You have to keep your bitcoin safe, so no compromise in trying to make things too lightweight on the settings to get less wear and tear due i/o
It's one of those things, I guess there is a sweet spot of strong encryption that is impossible to crack realistically but not some insane settings that will turn your SSD into a toaster when it practice due diminishing returns you don't get that much of a return.