I think so.. honestly I hate the new debugger and don't use it.. the old one was so much better. But since part of the reason I hate the new version so much is that it locks the testing to one suite/one tab, etc.. that trying to compare prod and qa is absolutely impossible... and testing using multiple tabs is impossible as well, that it makes the tool completely useless to me... I raised these concerns with the development team a few years ago, and while they agreed with the assessment, I have yet to see any improvements to the tool in this direction.
I continue to use the old version of the tool, and if/when that stops I would 100% actually rather go back to looking at the network panel than using the new version of the tool (which says a lot).
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That said, onto your second question... you can consolidate the two Launch properties, but it will take work, care and a lot of testing.
You will need to open up both properties and compare what is being done (make sure there is no inconsistencies or configurations that contradict one another)... You will need to choose one of these (whichever is used on more pages would be the ideal choice) and start copying rules/data elements/etc from one to the other... but also make sure that the existing rules don't already cover what you need...
You could use Resource Override to override the Launch file on the one that will go away with your dev version of the new main Launch Property, and compare the tracking.. see if the tracking is the same or different and make sure to make adjustments to the new main that keep those pages intact without changing the tracking on the pages it already serves....
Once you have everything merged and tested to your satisfaction, you will need to get your developers or operations team (depending on your organization) to update the Launch reference code for the pages that will be switched from one property to the other.
And of course, after this change is made, you will need to watch for and signs of issues in the event something was missed in testing.
While there is a copy function in launch that allows you to copy full rules or data elements from one property to another.. you must be careful with this as you may already have items that will work as is without the need of duplication... only copy what you really need...
Without knowing your implementation setup, I can't really help focus this down any more... it will be work, but it probably worth it in the long run.
