Facts, products,...

The *t* is usually there, though not in all accents/registers. If it's not there *at all*, then it's probably not a "prestige" dialect, though it can often be very, very attenuated, imparting just a little more attack/duration to the following sibilant.

No. In some accents, the t is not pronounced. In others, it is.

For me, it honestly depends on how fast I’m speaking and who I’m speaking with. If I speaking slowly/more clearly in a professional setting, I pronounce the ‘t.’ If I’m speaking quickly with friends, I don’t always

Generally speaking the -t is there in the sense that a native speaker is going to move their tongue into the position to make it as we say the word but there's a good chance the listener does not hear it as a -t sound. The difference the listener should be able to hear, in comparison to the word fax for example, is that as a result of moving the tongue up to the gum ridge behind the teeth the following -s sound becomes much 'sharper'.

unless heavily accented, yes, you pronounce the "t" in facts and such. To the point where "fax" (faks) is a thing that you have and/or do, or at least used to, you don't really see faxes nowadays.

In most US accents and in normal speech it's basically silent. Some people might 'hang' a little on the K sound, like in Italian how you pause on double letters for a moment. 'Fak-kss.' You will hear the T more in some UK accents or when people are being especially articulate.

I’m from the US. I do not pronounce the “t”. I hear and say “fax”

Depends were the speakers from, I would drop the t for the plural form of fact but not the singular form Eg facts = “faks” but fact = fact

The "T" is still there, it's just more of a quick slide. The sound is very similar to the "C" in "dance."

i heavily use voice recognition for my job, so if you want “facts” instead of “fax,” you’d better pronounce that T (acts/axe is another big one)

The T is still present in "facts." If it was silent, you'd get the word "fax."

No, the T is definitely pronounced. Facts is pronounced as spelled (fakts) and products is pronounced “prah-duckts”