I highly disagree, FC make exploration 50 times better. You can swap out ships, go to places you never could before, and so much more.No. Why?
Seriously, if you find the game dead, stop playing it. Decommission your FC and that's it.
In terms of basic Elite gameplay, nothing changed. If you enjoyed Horizons before EDO launch, then nothing stops you to enjoy Horizons now.
If you dont enjoy Horizons anymore, just take a break until EDO launches on consoles and then decide if EDO is what you want from Elite.
However EDO is not changing the base game - it just ads a new layer in the form of on-foot gameplay - so if you hate the base game now, you will still hate it in EDO.
Edit: and yes, strictly from an EDO perspective, carriers are absolutely useless. EDO only content is best played using Apex or a small ship.
The feeling of always having a place to return to. To sell data. Repair. To be able to go on extremely high G planets with no fear.
To be able to explore in numerous different ships. The feeling of progress as you make jump after jump with it and exploring a mini bubble around you before the next jump.
Then in the bubble, having all your ships in one place, is an incredible thing. They are one of the best things FD has added to the game.