We really want vote diversity here, so that's the point of the limits
The limits in place are currently determined in two ways:
Per-queue hard limits: after 20 reviews in a given queue*, you're done for the day - if you want to continue reviewing, you can switch to a different queue.
Queue-specific limits on actions: certain actions are rate-limited regardless of whether they're performed from /review. If you've reached the limit on an action deemed critical for a queue, you'll be locked out for the day (but you can switch to a different queue that doesn't require this action). Examples:
kof the gold badges are for review tasks, but that still doesn't tell you whether it was for clicking Approve for each suggested edit seen, or for carefully considering each, skipping so many, editing so many others, ... . So if you're the kind of person to want the badge for others to see, ...