Solder can become a cold joint or melt. Typically with AC or cable connections you either want to use a crimp or a lever nut (wago). Replacable recepticles in houses used to use wire nuts, but Wagos give better holding force, work with stranded and solid, and you can get ones that have way more connections like a bus bar.
And even if it is permanent, AC wiring can heat up and mess with solder, so crimping or lever nuts are preferred.