Graph taken from: https://www.forbes.com/sites/kalevleetaru/2019/03/04/visualizing-seven-years-of-twitters-evolution-2012-2018/
Source for people not liking the algorithm: https://www.theverge.com/2016/2/6/10927874/twitter-algorithmic-timeline
I was extremely active on Twitter for many, many years, and I never used the algorithmic timeline, as far as I could help it. They switched you back to it a lot, and I had to manually switch again and again, but I never had any issues with the timeline I curated myself.