I've lost count of the number of times I have had to reassure people that the site I help to moderate isn't going to just go away.
The association between a site being labelled as "Beta" and an expectation that it could just go away at any time is a strong one. Over and over again we have to explain that this is not the case on Stack Exchange, encouraging people to dive into asking questions and writing answers, secure in the knowledge that their contributions aren't going to be discarded, but it is hard work. It is work that we shouldn't need to do.
With the welcome acceptance of perpetual Beta as the new normal, an expected path for a niche Stack Exchange site, can we please consider again emblazoning the top of our sites with a confusing term which distracts us from our mission and often appears to discourage growth.
It is now over three years since Should we rename or remove the "beta" label? was asked, both of the two highest voted answers suggest the automatic removal of the Beta label after a year or 90 days respectively. The next shows several examples of a positive impact on site growth of moving out of Beta.
It has also been 7 months since Let's break up with "Graduation" and remove a bunch of "Beta" labels was asked, with answers there detailing more experiences of moderators struggling with growing their sites under the shadow of the beta label.
Finally, the new themes make the "Beta" status of a site even more prominent. Previously, the label was lower case and appeared smaller than the site title, now it is capitalised and the only thing which makes it less prominent than the site title is the colour.
I can understand the desire not to rush into a solution. But I think this first and simplest step is too obvious to delay further.