Oh yes, don't forget to include headache of making all the sounds easily available and playable, plus a mixer and a whole lot of cables, power supplies, and an extra shelf to store it all...
There's no right and wrong and it depends on the personal preferences. Yes, it's a bit of a headache to have to connect multiple keyboards, mix them and stuff. OTOH, it's much easier for me to have one hammer-action keyboard which has piano and Rhodes switchable, one synth with strings, pads (organs) switchable and one small mini-key keyboard with various mono-leads switchable, rather than having to remember what multi/combo/performance had what exact combination of those three categories, where's the split point, etc. Mind you, I've always been bad with memory and quick thinking ð But having three separate keyboards, each with 5-6 basic sounds that I select from directly, makes it much easier to me, rather than having to program and remember the hundreds of possible combinations when using a single workstation for all of those.
I have been there with multiple boards, FX and modules. After setting up everything I was regularly exhausted and hyper nervous before the show started. Where can I put my submixer? Where is that hum coming from? Which of the cables has that loose contact? Who has stepped again on one of my cables or power supplies? And so on... to me the Stage 3 was a relief. But I have to admit that it took me years to figure out how LIVE MODE really works and what the SETLIST feature can do.
It all depends on personal preferences for sure. But when you get older, less is often more.