Where more RAM is available, computers will keep more in RAM. If you remove your RAM leaving 8GB behind, you will find that in cases of limited RAM availability, your browser will most likely offload the "hot" frequently-used-tabs to swap, and data from your other tabs will be discarded, with the page being reloaded when it is switched back to. The margin after which tabs are dropped, so to speak, varies and can differ on different systems.

As I think you have found out, regardless of your RAM, having a lot of tabs open probably won't end up being a smooth experience. However, I think you'd be surprised to find that given less RAM (~8-16GB) your system will probably perform similarly. While it may be necessary for you to have that many tabs open to complete your workflow, most consumers don't need that, and would be able to get by without having to resort to thousands of tabs.

Given a bigger budget, you made the choice to buy more RAM, which is great and I'm sure your system thanks you everyday for it. However, I don't believe that the majority of consumers need to make that investment, or wish to spend the extra money for RAM which they probably won't make full use of.