Hm. I still think this relies upon a degree of familiarity with Chinese though.

If you don't know Pinyin then your phrase could be pronounced by an English speaker like "Wee-sheng-gee-anne zay nail-lee" and tbh that's going to to be pretty baffling.

But my point wasn't that you're not going to be able to communicate anything in Chinese but not to expect that grabbing a phrasebook would be sufficient to engage in basic conversation just from reading the Pinyin. If it were Spanish or Italian (or German, although you would have to go hunting if you want to find a German who doesn't know conversational English) you'd be able to use a phrasebook and scrape by with just that and nothing else because there's a lot of mutual intelligibility that exists.

But Pinyin is a different case because native English speakers instinctively do really weird things when they read words, particularly when it comes to vowels and emphasis, because our orthography is a fucking unmitigated disaster and it just doesn't play well with other languages, especially with the Romanisation of other languages which don't use the Latin script. I think that this is most obvious when you see an English speaker tries to write something purely phonetically without using the IPA. It's so damn hard to imply emphasis and even to clearly indicate the basic pronunciation of sounds, like with that "gee" I wrote above where you have to wonder if I intended it to be pronounced like "Gee whiz!" or like "Ghee".

This probably says more about the cultural insularity of where I live but one time I legitimately caught someone who read the name "Mao" and pronounced it as "Mayo" once. Crackers gonna have terminal mayo-brain and all of that, sure, but it says a lot about how native English speakers process language; if the same letters can be said as Máo or as Méiyǒu then you know you're in for a bad time.

If you're a complete beginner when it comes to Chinese then aside from learning the basics pleasantries I would probably just stick to memorising a few key words like toilet and food or restaurant because you're going to get by better if you just use them rather than trying to say a whole sentence poorly with a thick American accent.

Of course everyone starts somewhere and I'd encourage everyone to learn as much of foreign languages as they can, except for French, but I just wouldn't count on a traveller's phrasebook for communicating in Chinese the way that you would be able to if you decided to take a trip down to Mexico.