I've made tea frequently with already vaped flower. You need to let it steep with coffee cream so there's enough fat (maybe full fat milk but I always have coffee cream). I normally make it with a chai tea blend as it is a good flavor. I let it steep for a while in a teapot covered with a cosy or towel to keep it warm. No issue feeling the effects. It will smell like weed.

I am not a chemist but from what I understand about decarb, steeping it in tea is not sufficient.

This research paper seems to indicate that you could skip the decarb step if you will be steeping for ~60mins at a consistent boiling temperature. But it is likely much more effective to decarb for a few minutes prior to infusion. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5549281/#SD1

THC / actives are oil based. If you are making tea, add a bit of creamer or something for those oils to adhere to. Water won't extract or carry them very well. You need something with the water to dissolve and carry the actives.

You could decarb by putting it into some coconut oil and then slow cook it for a few hours. Strain while hot. Use the oil as part of your tea concotion.

The weed needs to be decarbed if you are going to eat it. To do so its heated on relatively low temp for a while until it browns.

I assume that those who did not decarb herb in oven instead steeped the herb in tea while it was boiling to decarb it.

To be safe and sure you've activated herb evenly and fully bake in oven for 30 mins at 230F. I put herb in mason jars which helps keep smell down and recapture terpene vapor released. As a precaution I put jars in oven at start of preheat so glass warms up slowly with oven. wait a few mins after taking out of oven for jar to cool and internal pressure to lower before opening.

If you invest in a dry herb vaporizer you get decarbed flower as a useful byproduct of vaping instead of ashes, one bird getting stoned two times or something like that

Also you can eat decarbed flower raw like just throw it into a smoothie or pill capsules and eat it. Don't have to make butter/bind to fat. Just drink plenty of water if you eat a lot of raw decarbed herb or the excess of plant fiber will dehydrate/constipate you

My understanding is that the hot water in steeping would decarb it. I haven't done tea, but I've made Pot Chocolate and heating the milk decarbed the weed pretty well.