You are right in saying 1.5 m/s^2 is the maximum acceptable acceleration of an elevator however there are many other factors taken into account in the real world which you omitted. I don't want to get started rn but there is mass of the elevator, the shape, the cable structure, the payload capacity, etc. Its not very fair to compare a game with real world that easily, elevator engineering is a whole another profession in real life. I am a final year engineering student with experience in elevator design as an intern.
If the elevators aren't being used to hide load screens, then there's no excuse to having them be slow. I bought the game so I could play it, not wait to play it.
The 1.5 m/s^2 "limit" doesn't have much to do with those factors which is why it's pretty much universal for all human rated commercial lifts regardless of their design, this is because it has to do with the comfort of the passengers in the lift, deceleration in lifts is also about half of that and that is usually the biggest limiting factor to lifts actual speed because the lift needs also quite a bit of time to slow down, beyond that there is a hard limit to the lifts velocity because it needs to be able to withstand an emergency stop, you can't be traveling at 50mph+ and then come to a stop in 2 seconds without people inside being tossed like like french-fries.
This is why the top speed of most residential lifts is limited to about 3m/s, even the Burj Khalifa with it's super hightech lifts operates only at around 10m/s maximum speed.
So I don't know which lifts you've worked on but please tell us so we could avoid them.