How to remove sign in popup from Magento 2 checkout page?

Magento2 has this authentication pop up on checkout page, which many store owners wont like to see on their checkout page.

Background of this pop up area and Related files

The pop up itself is generated by Magento_Customer::account/authentication-popup.phtml

But this pop up works very differently on checkout page. In fact this is a separate pop up than the one you see in header area. It is embedded in a series of js files which are governed by knockout-js

Other file responsible is: vendor/magento/module-checkout/view/frontend/web/js/proceed-to-checkout.js

Here is how to remove it finally

Edit file or overload the file

app/design/frontend/YourVendor/YourTheme/Magento_Checkout/web/template/onepage.html

delete the following lines and save the file

<!-- ko foreach: getRegion('authentication') -->
<!-- ko template: getTemplate() --><!-- /ko -->
<!--/ko-->

Reference:

https://github.com/magento/magento2/blob/2.2/app/code/Magento/Checkout/view/frontend/web/template/onepage.html

https://github.com/magento/magento2/blob/fc66fe443d87c4e69fe9022d7c95fe66e0565978/app/code/Magento/Checkout/view/frontend/layout/checkout_index_index.xml#L39

How to show correct item count in Magento 2 Checkout Order summary?

By default, app/design/Magento/Checkout/view/frontend/web/template/summary/cart-items.html file is being used
Or vendor/magento/module-checkout/view/frontend/web/template/summary/cart-items.html

To overload this file, create file cart-items.html in your theme folder. Make sure you place the file in Magento_Checkout/web/template/summary/

Edit the line

<span data-bind="text: getCartLineItemsCount()"></span>

And replace it with

<span data-bind="text: getItemsQty()"></span>

Reference Files:

vendor/magento/module-checkout/view/frontend/web/js/view/summary/cart-items.js

https://github.com/magento/magento2/blob/2.2/app/code/Magento/Checkout/view/frontend/web/template/summary/cart-items.html

https://github.com/magento/magento2/blob/2.2/app/code/Magento/Checkout/view/frontend/web/js/view/summary/cart-items.js