Google e.g. is a US company. US companies have to comply with the patriot act, meaning they have to help US secret services to access data Google collected. By doing so they would however be in direct violation of GDPR. This means from within the EU technically you should not use Google Analytics. (This has afaik to do with the ruling of the European Court of Justice, where a law which declared US privacy standards to be in alignment with EU privacy law was struck down).
And neither do I want to use Google Analytics. On my websites my visitors trust me with their data. This means it is my duty to understand what happens to their data on my website: what is stored, what is forgotten, what is sent of to which third party and for what reason. Google Analytics makes it kinda hard to understand that, so I'd rather use something that is simpler and stays on my servers and within the legal framework of my country.
Really? most customers don't really care.
I highly tune my Google Analytics to be as fast as possible and we get great insights from it, works great for me and also GDPR compliant to as I ask for the users permission.