we recently booked our air tickets for February '27 trip. ran the numbers with RT thru SJU, ones ways outbound to SXM/return from SJU, and multi-city itineraries via AA and DL with TW and/or WA/SBC connections. (I will consider outbound connecting thru SXM with PIV coddling but will not even contemplate return thru SXM.)
grand totals all flights and services accounted for (with front cabin fares) were virtually identical RT thru SJU and one ways SXM/SJU. so we're doing RT thru SJU with RT TW to/from SBH.
obviously those who fly nonstop to SJU or SXM from major markets may likely encounter different variables.