30|0 may not be as useful as 30|30 or 45|30. In any case, these longer time controls are clearly different enough from 10|0 or 10|10 that they deserve to be a category on its own. I would conjecture that weekend 30|30 tournaments would become increasingly popular, as tournaments that were online in 2020 are going back to in-person OTB. As fun as those tournaments may be, the travel expenses are considerable. Players interested in improving will eventually realize that classical time controls are much better suited for improvement, as @sholom90 said.
Well put. And that is, indeed, my personal strategy. Now that OTB tourneys are starting up, my main focus is on 30- and 45-minute games. I've found three clubs thus fat that host 2-round Swiss tourneys with those time controls:
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G30 -- has 30/10 tourneys on weekends
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Slow Chess League -- has 45/45 tourneys on weekends
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Dan Heisman Learning Center -- has multiple 30/30 tourneys every day
(Disclaimer: I'm an admin for the DHLC)
Thoughts:
1. If Statistics could be filtered by time control(s) one could then see their rating(s) for the various time controls. Plots for each on the same chart would be very interesting, assuming the sample sizes are adequate.
2. It would be interesting the see the game time control frequencies for all of Chess.com. Then one might appreciate Chess.com's logic in the decision to not offer Classic Time control. Ages ago I recall Danny Rensch's expressed amazement that the 10 minute time control was far and away the most popular.
3. I'd love to see the bar chart for all time control frequencies, (no counts needed just the relative sizes, if the counts are proprietary.)