Lace asked the hypothetical question: "where better than Luz" I answered that hypothetical question.
The rest of your questions are being prescriptive for the sake of it having no bearing on the question I was posed and answered.
If an OC like establishment were essential to snatching kids then the answer is to rid the world of OC like
establishments. Jobs a goodun'.
Your first sentence is fine.
Your second sentence is inaccurate. I have laid out clearly two reasons why Luz fits and Tavira does not.
As to the third sentence, IMO the OC should switch from mechanical locks to an electronic system.
The only real 'improvement' in safety to date is that the incident has already happened. Therefore anyone attempting something similar would probably cop for both.
I doubt this incident would have occurred in Estrela da Luz or any of the other complexes in Luz that use electronic security, and can track when tourists use a key to open the door.
If the patio door was used as an entry point, one has to shoehorn everything into 5 days, including twigging that the patio door was being used.
If the front door was used, the start time for planning goes back to when the MW scheme was dropped into the OC, with the realisation it contains information that the other reservation system does not.
The date of the Payne booking is possibly when the operation moved from agreement and recruitment to a more active stage of the operation.
If the window was used, it is required to explain how a perpetrator knew the shutter could be raised from the outside.
I cannot comment on shutters elsewhere, but I was surprised when I found out it could be done.
And if one thinks the McCanns did it, one has to come up with a body disposal route, or a concealment/retrieval/disposal route.
That happens to be easier in Tavira than Luz, but I'm confident very few people, whether locals or tourists, would have known that.