Not the person you asked - but for me it is that I check emails compulsively any other app I have to remember/tend to forget. Like Todoist is great but I can go weeks without opening it and I skip tasks because of it unless I set email notifications.
Hmm. SRS is a daily commitment though. If you skip it the reviews just pile up, which tends to be painful enough that you quickly learn it's a daily commitment. I couldn't imagine getting 150 emails a day to review stuff, or that being a workable UX.
With the original Anki algorithm the rule of thumb is your daily review load will be 5x your rate of new cards per day. So 10 to 20 reviews per day is between 2 to 4 new cards per day. Definitely not enough for language learning, which is my use-case, but may be ok for certain other things.