ios26 is required for the 17 series, yes. And presumably ios27 for the 18s, and so forth.
I’m not having any difficulties with ios26 on my 15 Pro Max, nor is my wife with her 17 Pro, nor my 85-year-old mother and her 12 Pro. Liquid Glass is just… there ¯\_(ツ)_/¯ but it’s not causing any problems for us. It certainly has its detractors but I can’t see exactly why other than vague “I don’t like it” sorts of complaints.
But, by all means… if it’s something you can’t adapt to, maybe switching is the answer. Personally switching would be a difficulty to me; I have been using iPhone since the 3GS and I trust Apple’s privacy policy far more than Google’s. But everyone needs to make that decision for themselves.