It feels like Studio One's instruments have been left to wither and die. At the very least commissioning _hundreds_ of new sounds for Mai Tai (and other instruments) and revamping the browse functionality might be a start (maybe similar to Synthmaster Player). A major omission is the lack of a good drum plugin (Impact opening across 46 mixer channels is _so_incredibly annoying). The Presence, Artist Instrument, Kits are quite good but are missing a good jazz/brush kit, and FX kit (or two) and several ethnic kits.
One gets the feeling that PreSonus is trying to monetise these instruments with the paid for add-ons but unless they step up to the mark, we will all just go and look elsewhere (as I have done)