[ID1452319]

My understanding is that you must tell people if you set cookies for any purpose, regardless of whether they are collecting personal data. Therefore, pretty much any content management solution, Wordpress site etc. will need to display a cookie consent banner.

[Reubensson]

I think you need cookie banner only if you use non-essential cookies. For example if you use cookies only for user auth, you don't need to display any notification about that.

[ID1452319]

My understanding was that you need consent before storing or accessing information on user's devices.

[detaro]

No, Reubensson is correct. The rules for what is essential are generally fairly strict, but only non-essential needs consent.