What difference would it make if the rules were enforced entirely vs. occasionally? As you have no control over anyone else's behavior I think you have to assume that some people will flaunt the rules and will get away with it, 100% compliance isn't a realistic expectation.
The current regulations requiring masks are in effect at least until May 31, 2022. Source of below info: COVID-19 | Italia.it (English)
The use of FFP2 masks remains mandatory in the following locations:
airplanes
ships and ferries used for interregional transport services
High Speed, Intercity, Intercity Night, and Interregional Trains
buses connecting more than two regions
buses/coaches used for chartered services with driver
local and regional public transport
indoor performances in theatres, cinemas, concert halls, entertainment venues and live music
indoor sports events
However, the use of the mask in all indoor environments and in all cases of crowded outdoor events is highly recommended.
Please note that nonetheless, in all situations, the following people are excluded from the requirement to wear masks:
children under the age of six
persons with a medical condition or disability that is incompatible with the use of a mask, and persons who must communicate with a disabled person
individuals who are engaging in athletic activities