In my relatively limited experience with this feature, I haven't historically seen the issues that you're describing. That said, I tried it out this morning and the behavior does seem to have changed a bit.
I reached out to the team and got some clarification - essentially, these published parameters were having an outsized impact upon our cloud infrastructure and performance and have become more restrictive, as a result. The new limit is 50 total pages, with a 15 second timeout per page. The banner in the UI will be updated to reflect these changes in the next cloud release!
On the other hand, there haven't been any changes to the way certain pages are excluded, meaning Retool does simple string matching in order to determine whether a given page should be vectorized or not. Any page whose URL starts with the specified string will be excluded.
Given these restrictions and the specifics of your use case, it may or may not make sense to instead utilize a third-party API. I'm happy to answer any additional questions you might have in order to find a solution for your particular use case!