Doesn’t Janeway drinking tea instead of coffee indicate this is a bad future?
Why would it?
The future Admiral Janeway came from in 'Endgame' didn't seem particularly bad to begin with (from what we saw). Aside from losing several more members of her own crew (one or two she was close with) until finally making it back home (which is more or less expected), it seems to me that the future overall was 'fine' to begin with.
The UFP seemed to have been stable overall (no impending threats or anyhting like that threatening its existence), and it managed to keep the Borg at bay.
The fact Janeway was able to keep crew lossses as few as she had was probably an achievement in its own right given how violent VOY's initial pull to the DQ was and unknowns she faced along the way while not having other SF ships for support.
The way I see it, Vice Admiral Janeway not drinking coffee is not a particularly bad thing. If anything, she LISTENS to the doctor - which is a feat in itself, and its better for her health (mind you, the same health effect could have been gotten by the doctor simply telling her to CUT DOWN on her coffee intake to say 1 or 2 cups per day - but I suppose in order to get the desired effect and break her 'habit' and drinking excessive amounts per day, the best thing to do would have been to cut her off completely to make sure she actually complies with doctors orders).
Also, certain things were likely going to happen the same (or very similar) way anyway.
Prodigy producers mentioned the USS Voyager was in a museum (or IS a museum)... the same thing happened in the 'original' timeline in which VOY took 23 years to get back.
So, certain events would have happened either way, while many others would have changed.
One 'bad' thing I think in the altered timeline (the present we are viewing) is that Icheb eventually dies (as we saw in PIC s1) - he deserved better - although, he was suspiciously absent in 'Endgame' either way - so he may have died in the original one too.