Tables\Columns\ToggleColumn::make('recommended')
    ->beforeStateUpdated(function ($state) {
        if ($state && static::recommendCount() >= 15) {
            // ... send noti about limit recommended

            throw ValidationException::withMessages([]); // this line prevents records updated, you may also use `throw new Halt()`
        }
    }),

Tables\Columns\ToggleColumn::make('recommended')
    ->beforeStateUpdated(function ($state) {
        if ($state && static::recommendCount() >= 15) {
            // ... send noti about limit recommended

            throw ValidationException::withMessages([]); // this line prevents records updated, you may also use `throw new Halt()`
        }
    }),