Hello,
I am grateful to you for sharing your inputs on this thought.
Sushant, I was trying to get an estimate of how many such emails might come. If needed, we can count only those grants or supports which are slightly larger in size. Starting from Rapid Grant, I do not have the exact count of how many Rapid Grant application from/related to the regions per year. I guess it will be around 10–12/year. Other grants such as Project Grant, Simple APG, APG etc open up at a specific time (mostly twice a year). I glanced through the recent grants pages and my hunch is actually it won't be too many. However you are right, possibly we can check how many emails the list could have got in 2020. In case if there could be too many emails, I think the suggestion you have made— fortnightly/monthly email works pretty well. If needed, the email can be treated as "for information purpose" and as much as possible the discussion can take place on the relevant talk page on Meta-Wiki. Thanks, Sushant for your inputs.
Thank you, Pavan for sharing your thoughts. I am not sure about this, I feel the moderators/managers can work to fix it if the emails are getting delayed somehow. Some time ago, I don't remember where exactly, I saw a similar post on some other large mailing list. On Telegram Wikimedia General Chat also I remember seeing volunteers came in to help in moderation.