Yes, as a Tyros 3 Owner I never received any additional voices, sounds, effects, etc as part of an upgrade. Yamaha only offered Premium Voice/Style Packs that required you to first purchase Memory to store them. Right after I purchased the memory (thinking I would have lots of future packs to add) they introduced the Tyros 4 and all subsequent Premium packs were not compatible with my T3.

As to the WS's not starting the arp on a specific beat, that has never bothered me. I use the "Next Measure" option and it works fine for my needs. So not an issue for me.

Yes. I believe that if you get use to a Touch Screen on another keyboard going back to a non-touch can be difficult. Both my T3 and Motif do not have a Touch Screen so again not an issue for me.