Pretty much any new low-flow toilet works because it starts the flow by moving the water faster through good design. So, it is not a problem unique to Toto, but would be true with nearly any brand.
When you do flush a toilet, it assumes that it is starting with the designed level of water in the bowl. If, for some reason, the level was reduced (depends on how much), it may not flush well and require a second cycle (the first refill resets the bowl water height, the second does what the first would have done had it started full in the first place).
how much, if any, of a problem it might be varies from none to annoying depending on exactly how yours are connected, the distances, and the piping layout.