Or, you stealth surprise the hag in her own home and kill her in 1 turn like I did.
Stealth is not useless. It makes pickpocketing much easier, especially Ethel early in the camp as well as the blacksmith, and especially the Zhentarim. Pickpocketing early scale armor+1 is a huge defensive boon to your party.
Besides, you've done a half assed alpha state early access and with no full content availability and think stealth is easy just because the 4-5 bosses in the game are mostly isolated with wide open terrain? Granted, this also means individual surprise attacks may be gone by the end of this alpha, but stealth and stealth checks are two separate matters, and it's certainly more useful at least than the 90% of the garbage concentration spells you can't use because the concentration mechanic makes sure you can use nothing but Bless, Hex, Moonbeam, and Armor of Faith throughout your party.
There's a lot less useful crap in this alpha than stealth. I certainly noticed the difference in annoyance when poisoning the Goblin cauldron at the camp if I used Guidance or not, if I used Blessing of the Trickster, or if I tried stealing boots of speed at the myconid colony.
Now staves, that's what I call useless. How rewarding for a caster to feel compelled to take medium armor proficiency to wear a shield, or a druid just wielding a club and shield instead of his Faithwarden staff because they couldn't be bothered to justify Staves in terms of combat boons to a caster.
There's a lot to discuss in your reply, but I'd like to limit the scope to just the viability of the Chain Shirt +1, so I'll be brief. I might discuss your points at length in a separate thread.
So, by and large, I agree with you on the non-viability of the majority of Concentration spells. I'd add Flaming Sphere to the list of useful ones. And my druid uses shield and club, as there's no combat reason to use a staff at all, since Shillelagh turns the club into a D8 weapon.
As for stealing from merchants, it's something that I just don't do with my characters for role play reasons. They might steal from that goblin merchant, though.