So the thing with tails is that you are very well anonymised online provide you use it properly.
It also runs entirely in RAM and leave no trace of your activities on the host computer. That's super handy for journalists, drugs buyers, secret agents, and unfortunately the very worst kinds of criminals. Its a tool that can be used for great good, playful mischief, or abhorrent evil.
It's not overkill per se, but if you instead just use whonix in your normal workstation people will feel less inclined to presume you're one of the worst kinds of criminals and you'll get more or less the same benefits. After all, TOR isn't shy,it's just a really robust VPN, but do you actually need an antiforesic operating system...
If you travel it is a handy USB to have. It has tools that could help you break a big story, or regain some control in adverse circumstances. But your privacy still isn't guaranteed.
Think of keyloggers and screen scrapers like someone looking over your shoulder while you're writing a letter. Putting the letter in an envelope before posting so that people cant read it whilst it travels trough the postal service I all well and good. But at least one person saw you write it, and they might know who you are, even if you wrote with your other hand to normal.
I shirt, don't presume tails is so secure that your host machine cant deanonymise you.
And most importantly, don't use it for shady things. Just try a bookable Linux distribution of your choice with a whonix gateway/workstation.