I'm not trying to persuade you to stick with DIY, but just want to give my perspective...
Basically, all of the issues you bring up pervade the commercial speaker industry and the audiophile hobby in general. They are not specific to diy speakers and so, don't really serve as effective critiques of DIY. Indeed, I think the diy community fares better than average and I think your characterization that many are dismissive of measurements is not fair. Sites like hificompass, data-bass, and zaph audio have been collecting objective data for longer than ASR has. As for celebrity phenomenon, isn't that just the human condition? It is abundant even here on ASR, where a contingent, instead of focusing on the data, treats Amir's personal value judgments and opinions as gospel.
You brought up the LP6... I really think that is cherry-picking. Much like the lsr305, the lp6 is a value monster and wrecks everything in its price bracket. It wrecks countless commercial speakers that far exceed its pricepoint. That many diy designs don't exceed the value proposition of the lp6 is not much of an indictment of diy speakers.
And I actually have a counterpoint - the Parts Express C-note. These easily play in the same price-performance ballpark of the lp6, particularly if you have a listening space that can take maximum advantage of the EBS type port tuning.
As for drawers full of budget drivers, isn't that a personal thing? Eschewing diy, one could just as easily have drawers full of vacuum tubes, phono cartridges, and fancy power cables. Or conversely, have it full of cheap Chinese USB DACs that all perform audibly identically. Marie Kondo, anyone? With the skills you've acquired along the way... those parts could potentially go into car audio systems or cheap+cheerful gifts (with a personal touch) to friends/family/kids that kick the absolute crap out of the soundbars and bluetooth speakers they would otherwise be using.
Finally, over the years I've read countless accounts by audiophiles afflicted with gear lust, FOMO, buyer's remorse, or endless tweaking who feel that the hobby has interfered negatively with their enjoyment of music. So again, it is not something unique to DIY.
Now, something I'm surprised you didn't mention is how difficult, easy to screw up, time-consuming, and labour-intensive it is to achieve a finish (be it wrap, veneer, or paint) that looks good and not amateur-ish.