So, is a biscuit joiner completely useless?

So, is a biscuit joiner completely useless?

DEWALT 6.5-Amp Biscuit Joiner Kit - Power Townsend Company

I Ate Only Whataburger for A Week to Become Texan

★Zero to 90 degree adjustable fence positions,Adjustable fence allows the tool to be set on an angle for easily joining mitered pieces. ★Pre-set depth

Dastool Biscuit Plate Joiner kit Accessories with 1x4 Blade,Adjustable Angle

Use (or Avoid) the Force! — Branching Out Wood

Build a Lift-Lid Box, Part 1 - FineWoodworking

I might have been wrong: A closer look at the biscuit joiner. Is it more useful than I thought?

DEWALT 6.5-Amp Biscuit Joiner Kit

Plate Joiner Kit

Reviews for WEN 8.5 Amp Plate and Biscuit Joiner with Case and Biscuits

Get More Bang From Your Biscuit Joiner