When you write everyday, it becomes easier to write.
Writing everyday sounds like you're doing more work than writing less frequently. In fact, it gets easier because simplifies your writing by breaking it down to daily chunks.
As the total number of writings increases, the pressure to write a masterpiece per writing decreases.
When you write everyday, it's easier to decide on the topic to write about. You are free from decision-paralysis. What you can't write today, you can write tomorrow.