We have a limited amount of time. Much of that is already accounted for, in one way or another: a job, parental responsibilities, household chores, socializing with friends, watching reality TV. The time we have left is our free time. That time can be filled with as many things as a person can think of or used to focus on a very few. Multiplying the amount of things we choose to focus our time on certainly does dilute all of them. Individual projects take longer to finish. Excuses allow things to get pushed aside one more time, perpetually.
If we multiply the things we do during the small amount of time we have left over, the quality of time spent on each will decrease and none will be done up to their potential or ever get finished. Our experiences become diluted and the tasks become aimed in the direction of meaninglessness.
From a practicality standpoint:
Choose one thing to focus on during the short bursts of available time. Focus on it.