Universal Spanish is a form of Spanish companies use in their content that is appealing to all and offensive to none. No one actually speaks it.  The problem is that readers perceive it as generic.  Better to carefully choose your Spanish-speakign markets and translate content for them specifically.  You can eliminate idioms, cultural references, etc., to make it more global, but it’s better to target your largest or first Spanish-speaking market specifically over doing them all at once.