Dear @SC-5922,
Thank you for posting your question in the Microsoft Q&A forum.
Based on your description, Outlook on the web and the new Outlook experience do not currently provide full feature parity with classic Outlook desktop for meeting and attendee management. Specifically, the classic Tracking table which allows meeting organizers to clearly view, update, and manage attendee responses in a persistent, sortable list is not available in Outlook on the web. Instead, attendee responses are presented in a simplified, collapsed interface that requires additional interaction and does not support the same level of ongoing attendance curation.
At this time, there has not announced a committed roadmap item to restore the classic Tracking table behavior in Outlook on the web. To ensure that your idea reaches the appropriate product team, I recommend submitting it through Microsoft Ideas · Community, which is the official feedback channel reviewed by Microsoft's engineering and product teams. If multiple customers submit the same idea, it can increase the likelihood that it will be considered in future updates.
In the meantime, workaround still is using Outlook desktop app. Once again, I can empathize with the experience you are facing.
If you have any other question, please feel free to reach out.