Hi @Apex, have you ever had to find clean frequency at a site that has hardly any left to work with? Each PTP link requires it's own frequency. A sector uses one frequency for multiple clients, therefore keeping open frequency for relay links.
Nobody can stop anyone from making dead end PTP links but that doesn't make it a good idea. Frequency is not becoming more, not only the CTWUG network uses the 5ghz unlicensed spectrum. Ask some of the guys with the bigger sites how difficult it is to 'tune' a link in an area where clean frequency is scarce. A properly tuned sector can do extremely decent bandwidth.
I don't build my site based on perhaps/maybe/could be (of dalk). I connect clients to sectors and if they have potential for a relay link or want to host clients close to them then only I do PTP.
Ask them and their clients how well that is going for them. Imagine taking a 10meg Internet line at your house and sharing it with 10 people. Is everyone going to get the 10meg? No, everyone is going to have a terrible time when everyone is using the bandwidth at the same time. Each Highsite has X amount of bandwidth that it can bring in from it's peer highsites, give everyone dead end PTP links from your site and the same bandwidth issues as mentioned above will occur. The only difference is that with Wireless links it is worse, you are not only wasting bandwidth but also frequency that could have been used at your own site for relay links help out the greater good.
My input is not law, it is merely my opinion. Use it or don't use it.