No, I believe the dev should adopt whatever workflow works the best for them. A lot of abandoned games also had monthly updates or similar small-scale ones.
However, I will be obliged to agree if you say it is a personal preference.
Some people prefer weekly or bi-weekly updates (because they can get more involved with the game development), others prefer monthly updates (a small chunk of gameplay every month, to keep coming back and tracking progress), and some prefer Komisari's style (almost yearly progress, but a lot of content) while they follow on Patreon/Discord/etc. just to check if the project wasn't abandoned.
Of course, if the game updates every month and Patreon pledges renew every month, monthly updates are much easier to track (and therefore, manage your budget) than longer periods (where you need to read posts, like devlogs, to check for activity).
At same time, if you don't have a deadline, you don't need to rush development. In other words, you can take sprints whenever Lady Inspiration decides to pay you a visit. Whenever she visits you have great progress and a sense of accomplishment; but the price is that you may spend months without any meaningful progress.
But regardless if they are relying on Lady Inspiration, just taking it slow and steady, aiming at expanding their Patreon base or to involve community in development - I believe this is a developers' choice to make, and ours to respect.