Additional context:
Native speakers of my mother tongue do not all understand each other due to some pretty extreme dialects. Now that I’m in Europe, I’ve noticed multiple instances of people sometimes not understand the dialect of someone from a village 10-20 km away…
In contrast, for example most American, British, and Australian people can just… understand each other like that?? I never thought much about it before but it’s pretty incredible


you forgot
The second one is not a big problem. Within the Spanish speaking world, only a couple of accents give ‘universal’ problems, really. Some Chilean variants, some Caribbean variants, some Andalusian accents… Otherwise, it’s fine.