Prevent MacBook Pro from turning on by touching trackpad

Same situation here - shut down the MacBook 2018, then wait a few minutes, touch trackpad or any of the buttons and it starts booting up. Very annoying.

Found the answer here Turn on (start up) your Mac Looks like it's the expected behavior. From their support page:

Additionally, MacBook Pro (2018) and MacBook Air (Retina, 13-inch, 2018) turn on when you press any key on the keyboard or press the trackpad.

Which is exactly my case.

Ok, following Sam's recommendation, I have tried to force shut it down using the touch id button.

In that case, the MBP behaved as expected, i.e., it would only turn back on using the touch id button again, and would not turn back on by a simple touch on the trackpad or by pressing a key on the keyboard.

EDIT: after a couple more tries, it appears I was mistaken, in the sense that even force shutting down the laptop does not actually solve the problem (see the discussion in the follow-up question Why won't my new MBP actually shutdown when I click "Shutdown..." in the "apple" menu).

Unfortunately, the issues remain that when I click on "Shutdown..." in the "apple" menu, the laptop does not seem to fully shut down. It looks as if it does (turns black). But then a simple touch on the trackpad or a hit on any of the keys "wakes it up", as if it had been turned off and was powering on again (it goes through the black background screen with the white apple in the middle and the progress bar).

This, unfortunately, has nothing to do with how long I wait between clicking "Shutdown..." and pressing a key or the trackpad: This has happened many time after waiting the whole night between clicking "Shutdown..." and pressing on the trackpad. In fact, I have clicked "Shutdown..." many times in the last month without ever having to press the touch id to power my laptop on: I always simply pressed on the trackpad, which made me believe this was the new normal with MBP and triggered my asking of this question.

Anyways, I feel now like the issue is separate from the question I asked (i.e., my real issue seems to be that my laptop fails to actually shutdown when clicking "Shutdown...", which is different from what I described). So I decided to ask another question about it: Why won't my new MBP actually shutdown when I click "Shutdown..." in the "apple" menu

UPDATE: For a couple of weeks, I've been using another MBP with a wider screen (I believe 15in as opposed to 13in) but bought around the same time.

It's really weird, this one seems to have a feature where the clicking of the trackpad is blocked (I mean physically blocked, with an actual resistance) until the laptop is turned on using the fingerprint button. This is not something my smaller screen MBP had (there, you could always click on the trackpad).

This gives a clear --- if somewhat weird --- indication that the laptop is actually fully shut down as opposed to sleeping.