Google defaulting to ignore system settings and use Google DNS server is an issue.
But it's cute how ISPs are trying to mash deploying of DoH support and default to Google server into one issue.
The last paragraph absolutely seems like fearmongering:
Moreover, the centralized control of encrypted DNS threatens to harm consumers by interfering with a wide range of services provided by ISPs (both enterprise and public-facing) and others. Over the last several decades, DNS has been used to build other critical internet features and functionality including: (a) the provision of parental controls and IoT management for end users; (b) connecting end users to the nearest content delivery networks, thus ensuring the delivery of content in the fastest, cheapest, and most reliable manner; and (c) assisting rights holders’ and law enforcement’s efforts in enforcing judicial orders in combatting online piracy, as well as law enforcement’s efforts in enforcing judicial orders in combatting the exploitation of minors. Google’s centralization of DNS would bypass these critical features, undermining important consumer services and protections, and likely resulting in confusion because consumers will not understand why these features are no longer working. This centralization also raises serious cybersecurity risks and creates a single point of failure for global Internet services that is fundamentally at odds with the decentralized architecture of the internet. By limiting the ability to spot network threat indicators, it would also undermine federal government and private sector efforts to use DNS information to mitigate cybersecurity risks.
I don't see how IoT management is going to be affected by DNS resolution made by a browser. CDN's DNS server in any case sits upstream and should be able to perform needed optimization. Google's or any other US DNS provider is not exempt from complying with the US law and court orders.