quite a bit of software you would need to understand the assembly. not everything is web-services.
I've only needed assembly once in more than 20 years of programming, not a webdev
It was during university to get access to CPU counters for better instrumenting, like 15 years ago. Havent needed it since
I've found LLMs (since Opus 4.5) exceptionally good at reading and writing and debugging assembly.
Give them gdb/lldb and have your mind blown!