I was looking to switch from Squarespace to Shopify because Shopify has more features that I need/want, so I tried the 2 week trial. I am looking for something specific that I just could not find or work around to get what I want. I need to be able to put additional information below the product. Full blocks of text, pictures, products... whatever I want. I installed the app that I could add "accessories", but that just does not give me the look for my website I want, nor did it work for the products I sell. For one thing, the pictures were way too small and I did not have the option of moving it where I wanted or changing the style too much, and the number of items were limited. Here is a page of mine that shows what flexibility I need to be able to do with pages. I have the product chart and its information, then below a text description of all accessories needed, then each accessory product to either add directly to cart or open the product page, then more text and more accessory recommendations.
If this is not possible, then I am sad to say that Shopify cannot be for me.
Was I missing something? Can I fully customize below products with text blocks and product blocks, etc?
I see that you're looking for a way to fully customize your below products. This is quite something new to me, still I would like to send you to the help from a migration tool developed by littExtension. As a former user, I suggest you reach out for their All-in-one migration package, with which you will be able to discuss with their experts about what exactly should be done in your quest.
In case it's less complicated than what I thought, you can have a look at default package. With either one of the two methods I mentioned, you can rest assured about the result as they always provide effective, highly secured service and 24/7 diligent support. Now give it a try