Regarding TP being merged into MP

[Kurando]

Although they weren't MMOs, some older FF games also had skills/magic fall under the MP value. So it could just be from a consistency point of view that's what SE decided for FFXIV, as TP weren't that often associated with FF much to begin with.

[MrKimper]

Although they weren't MMOs, some older FF games also had skills/magic fall under the MP value. So it could just be from a consistency point of view that's what SE decided for FFXIV, as TP weren't that often associated with FF much to begin with.

Pretty much this, Final fantasy games have always had physical and magical skills come from the same source, MP, discounting when you only had "uses" of spells.