A customer might think, 'Wow the company is falling apart and the remaining founder seems lost in his own world. I should find another vendor.'
ICYMI, the departing executives in question did post about their plans, and (similarly to the OP) with a bit of reflection on their part:
https://hackernoon.com/after-6-incredible-years-at-buffer-im...
https://medium.com/@sunils34/parting-ways-with-buffer-ee016b...
There doesn't seem to be any reason for customers to be concerned, and the contemplative style of the post is by no means new. On the contrary, it would be a matter of concern if the post wasn't primarily concerned with a retrospective on how they got to where they are today as well as individual styles, goals, personalities, and emotional fulfilment.