It is really important that no single project or company dominates the web. Any browser based on chromium is not going to be well received by people concerned about current engine diversity. Whatever people think of the Mozilla corp or foundation and their stewardship, there is a strong public interest in promoting wider use of the Gecko engine and any other Blink alternatives. Many here will be running forks like librewolf to remove Firefox features we don't want or trust.

In a healthy ecosystem people will use a diversity of products that suit their individual tastes and needs and that is fine. Advocates warning against over dependence on Chromium are doing it with very good intentions. We don't need everyone to switch. We only need enough to avoid a mono-culture and the death of the open web. There is plenty of room left for diversity and freedom of choice.

The majority don't even think about what browser they are using and use what is installed by default. They are the real battle. If a fraction of them did some research and made an informed choice, even if many chose Chromium browsers, the ecosystem would be much healthier.