Hi,
for me, keyboards are only a hobby.
First 10 years, new models didn't arrive quickly enough. I think new functions & progressively better quality sounds kept me upgrading.
Always had a Technics plus owned a few rolands & a couple of early korgs.

Had a 2 to 3 year break round about 1999, sold everything except a Technics arranger piano, bought a 9000pro roundabout 2002, not overly wrapped, bought a 2nd hand VA7 from a friend, (variphrases attracted my attention) Rediscovered Technics ( KN7000 ) & the VA7 went out the door along with the 9000pro.

2004 Technics stopped production. Goodbye KN7, took up softsynth/software arrangers.
Missed not being able to share styles & stuff ( everyone used different soundsources).
Bought A Ketron SD1+, style editing functions were a total let down for me ( sold recently), bought a psr1500 a couple of years ago, wasn't sure about Yamaha, though I do like some of the styles, hence I didn't go fo a T series. I'll keep the psr, not worth much anyway.
Approx 18 months ago I bought the PA800.
Working out well for me. Plenty to keep my brain occupied.
Will I upgrade?, only if the new korg has something better to offer. Some super duper new style creation tools, or maybe the 8 fills & a break, ( that Diki seems to think we need haahaa)
Would I upgrade for additional styles, NO,
super duper sounds hmm maybe,but I doubt it. In the styles, better off sticking to factory sounds, for better quality melody sounds, I can load samples, or add a soundmodule or vsti player.

best wishes
Rikki