I guess they do it on purpose to force you to buy a new one
You might be right, I sense the same. My previous phone, an iPhone only lasted for 2 years and then another year with a new battery. I also sense that updates shorten the life time of our phones, they basically get more clogged up.
The technology is there to make way better and longer lasting equipment than in the past, yet everything is made to give up way sooner, nowadays.
Have a nice day.