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ROS is only made for C++11

this is actually not really true.

For ROS 1: Melodic has lifted the max version to C++14 (see here).

For ROS 2: all ROS 2 versions target C++14 by default (see REP-2000, search for "Minimum language requirements").

What happens if I just put add_compile_options(-std=c++17) in the CMakeLists.txt of my ROS-package and use C++17-features anyway?

Nothing. It probably will just work, as long as your C++17 object code is ABI compatible with whatever libraries you are linking against.

In other words: you'll potentially run into the exact same problems you could have with ABI incompatibilities between libraries when not using ROS.