Disclaimer: I'm actually a colonist, so my opinions may not count.
I grew up on Lipton tea. Pour boiling water over the bag, steep, add milk and sugar just prior to serving.
Since then I have reduced my sugar intake (multiple times), learned to take tea without; to me it tastes wrong with only milk, so now I take it black.
Meantime I also discovered better teas. I now buy my tea online from Harney and Sons. Their English Breakfast blend is my go-to, but I mix it up a bit sometimes. Bridgette's Blend is one of my favorites. But I digress.
Now that I've re-trained my palate, Lipton tastes abominable to me.
I still make tea the same way, except it's usually loose now, but boiling water brings out the flavors. I only make a cup at a time because it's just me. I use a Chef's Choice electric kettle to boil the water. (I keep one at home and one at work.) Microwaved water is an abomination. I use bottled or filtered water; tap water here in Sacramento is an abomination all on its own.
I use one of these for my loose tea: https://www.harney.com/finum-permanent-tea-filter-large.html
Does the coffee pot brew the coffee or merely warm it? If the latter, it seems like it would be too cool for proper tea. But I don't know much about brewing tea in a pot, so maybe it's not that bad. Brewing tea like coffee sounds completely wrong.
Adding milk while it's steeping would cool the water prematurely, that sounds wrong too. But I'm still of the "pour boiling water over dried leaves and steep" camp.
How long to steep is a matter of taste. You Brits seem to like your leaves ground, which goes bitter after a few minutes. I prefer whole leaves, but I'm careless about the timing. Consequently I've gotten accustomed to a touch of bitterness.
My own opinion, for what it's worth, is that making it in a coffee pot with milk already added is an abomination. I would also be annoyed that somebody would decide for me that my tea should have milk, and not give me a choice, quite aside from the issue of proper steeping.