If you notice, when start your car, RPM will be around 1500.
If you engage say Reverse, the RPM will immediately drop to around 1000.
I think the car does this to protect the transmission already.
So don't really need to wait till RPM drop to below 1000 to engage gear.

Usually I wait blue temperatures off then go. Recently saw video said wait rpm drop below 1k for gearbox better protection.. that y confuse. Because feel wasted fuel wait too long..

Bro, every oil got operating temperature including transmission fluid. If too cold it will also thicken up, slowing the oil flow (just imagine honey in low temperature). Installing addtional/aftermarket atf/cvt cooler without much research/data just increase the wear rate if you always drive in cold weather without proper warm up.
Before installing any of it check what is your normal ATF temperature like during like traffic jam, going up hill or fetching heavy stuff or trailer. Once you got the temperature data, check your original ATF gearbox spec. what is the optimal temperature range. Dont simply follow some mechanic or member peer pressure that all oil cooler must be good, a lot of time is waste money and more things to worry if done wrong (more hose, area to leak ATF oil)

when the engine is cold, you cannot do this:
- in N (Neutral) tekan the accelerator to raise the RPM to 3k
- release footbrake
- engage D (Drive)
- this will warm up the auto gearbox immediately
Note:
- do the exact reverse to jaga gearbox upon first engagement, do slowly
- warming up the car does not warm up the auto gear or gear oil

The thing is, economy car equipped with cvt tend to drive better when cvt is warmed up, my experience with 2 diffrnt cvt car.
However, this doesn't mean u need to wait few mnt idling. just start, the car and drive slow n steady out of housing area and bla2, once the cold temp light is out / 2 ~ 3bar temp, drive as usual lor.
why all the confusion here?

I drive both CVT and AT cars. From experience, during a cold start, letting the engine warm up a while before driving is much better. Why? When it's cold, and you straight put it into D or R, the RPM straight drops, and where does the RPM go? Straight into the GB, causing a kickback.

If you noticed cold start RPM is always higher (Idle ~> 1k), Innova 2013 (4AT) is ~2k RPM, HRV 1.8 ~1.5k, Axia ~1.5k. and when you engage a gear, the RPM will drop almost instantly. It's not like the engine will slow down only your GB will engage.

If not mistaken there's a video out there on Myvi's not sure if CVT or AT about the GB oil seal getting damaged due to the pressure from a cold start when changing into gear.

The reason RPM is higher ( COLD START ) because O2 sensor need to be warmed up to get good reading, if you read OBD data, it will say that it's not warm/operating temperature so it will use pre-set RPM/AFR by MANUFACTURE to help warm up O2 sensor, don't believe me? got buy O2 reader and get the reading yourself.