Facebook implemented "2G Tuesdays" (https://www.nbcnews.com/tech/social-media/facebooks-2g-tuesdays-slow-down-internet-employees-n452466 https://www.nbcnews.com

Facebook implemented "2G Tuesdays" (https://www.nbcnews.com/tech/social-media/facebooks-2g-tuesdays-slow-down-internet-employees-n452466 https://www.nbcnews.com/tech/social-media/facebooks-2g-tuesd...) where developers would get 2G speeds when doing anything related to the website. That gives them the experience of people with very poor connectivity and probably improve their experience. Just like you said, if it runs OK on 2G, it can only be fast enough on 4G