I thought I remembered being able to do Joanna and Valentina's events on alternate days. Since each LI route involves multiple events across multiple days, it might be a little immersion breaking to have to complete all of the content for one in order to move on to another, especially as the number of LIs and events for each LI increase. You'd effectively have to ignore the other LIs while you completed the events for one for days at a time. If access to further game content is locked behind completing a LI's content, that could make the story even more complicated to navigate, as a player at least, when the setting changes again. If someone got into a situation where they'd accidentally began a route for a LI and didn't realise how, they'd have to start the game over to try to do anything else with another LI or maybe even to see more of the story
All the girl specific days happen on the span of one day and, during the start of each one of them a plausible reason is given for "ignoring" the other two girls.
Think of it like a date day with each one of them, you'll spend most of the day out with the girl and will come back home only when it's already too late to do anything else with the other girls.
Of course, we're talking about Joana, Luana and Val's centric days in the current game content.
What I mean to say is: Dude, relax... It's just one day away from the other girls, they won't go anywhere or meet another dashing roguishly young man in the meantime.
Also, bear in mind that BETAs are updates that are currently ongoing development and only meant of a "what has been done so far" kind of concept.
If you'd wait for the full update, then you wouldn't have the trouble of starting an unfinished path.