Sorry for the delay, @Felipe24.
(1) Hard to say for certain without seeing your HubSpot instance, there may be [old] automation set up. I would test out a few test contacts and monitor their activity feed but in theory, yes this could be used exclusively for reporting.
If you go to edit the Lifecycle Stage property, you can see where it is “Used In” that will give you an idea of if the property would change anything else. (See attached screenshot)
You may limit the impact by creating a new lifecycle stage for “Conversion” or something like that, that way if there are any
(2) I do not beliebe at this time you need enhanced conversions to connect lifecycle stage conversions from Google Ads to Hubspot.
However, the documentation does say:
The Turn on enhanced conversions option in your Google conversions settings will also be automatically selected within 48 hours of the first event sync from HubSpot. You do not need to manually turn on this option to sync new or existing conversion events for form submissions.
