Given that they are still tweaking the firmware of the wireless charger, I think that's guaranteed!I wonder if Apple 🍎 will software tweak the modem in the future?
The more interesting question is whether the tweaks will affect anything we care about. My guess is yes (ie the tweaks will likely [slightly] improve battery life, performance, and fix various minor and country-specific inconsistencies, probably also various [hopefully minor] weird security cases).
I say this simply because every project runs out of time, with a the least significant bugs left unresolved. Each successive modem release will be more polished; but being the least polished modem at release time also means the most scope for fixes.