If I understood properly the TNC for APRS is external. There is no GPS for position for APRS beacons so most of the SOTA relevant features are missing (at least the one that I highly value).
Dual-RX and CW/SSB support are rare features now so that might be other reasons for getting the TH-D7.
You can self-spot with a simple handheld and an APRS app like Aprsdroid.
See here: APRS spotting on the (very) cheap
This would work with the TH-D7 too.
If you want an ‘all in one’ solution get a modern one. Yaesu is a bit “special” in the ways APRS is integrated in the FT1 to FT3 series.
I have the FT1xde and are okay with it.
Icom seams to have a lot better implementation from what I heard.
But it’s a matter of price.
73 Joe