i really think putting prescribed ASI in backgrounds must've been one of the most braindead decisions the Wizards design department must've had, one step forward, two steps back, they had floating ASI and pretty much everyone was happy (even if some like myself were lamenting the lack of default guideline ASI on the newer species coming out).
IMO backgrounds should avoid the more fundamental stuff of character creation like ASI and even probably skills (okay i know that second one makes less sense to avoid but look at how access to certain skills bias background selection) and just try go for quantity on the smaller and more niche traits that aren't so easily attained but which can work well to build the theme of the background, your sailor rather than +2,+1, acrobatics and perception, navigator's tools and tavern brawler which feels rather generic, gets a swim or climb speed, navigator's or cartographer's tools proficiency, water vehicle proficiency, hold breath/1min, proficiency with scimitars and tridents and advantage on any sleight of hand, survival, history, nature or persuasion check related to what would be considered 'sailors knowledge'