currently, the userbase is shifted more towards the high-end power-user Windows user, or average Linux user.
Most people I know tend to make trunk builds because OpenWRT development times were kinda slow and most cool stuff (packages) was always in trunk.
OpenWRT was/is mostly sought after (again in people I know and see/interact with around the net) because (in no particular order):
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it is opensource therefore trustworthy for security/privacy
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it receives updates and keeps secure even very old devices that would be EoL since like 4 years but work fine. (may be not 100% fast on this but anyway it does a better job than the manufacturer)
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it allows to have pro-router feautures like true badass VPN servers, support for ALL Dynamic DNS (not just 2-3, curse you), VLAN with a pro-switch-grade GUI too, and decent QoS without shelling out 300$ for a gold-plated octa-core warp-9.99 wifi router.
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its secondary (non-networking) features are actually reliable and work EXACTLY the same on all openWRT routers (media sharing features, 3G/4G dongle support, various servers) so once you learn how to configure them ONCE you know how to configure them any other router. That's a BIG thing if you are into using LEDE in a techsupport shop for consumers or if you are the "techie friend" of many people. Most smart router manufacturers lock you in with consistent firmwares (like Asus, actually not even bad, they are probably the only one that is actually designed to support Entware packages, a fork of OpenWRT package feeds), some are just plain inconsistent even within their own products.
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because they tried to do something that isn't basic stuff with dd-wrt (like say VLAN, or trying to host a ftp server, just try yourself) and noticed the horrible mess that dd-wrt is beyond basic usage and giving you good wifi performance on broadcom, and how total garbage is dd-wrt wiki (manages to be worse than OpenWRT's, personal experience) see for example here and here
AFAIK most of the mesh wifi thing is german-only that happens in a few downstream projects, I didn't usually see people talking of mesh wifi and OpenWRT, they are all using some downstream fork with a funky name like freifunk or whatever (there is a list of them in the LEDE wiki main page as Endorsements).
(little OT, freifunkers have built a webapplication that allows them to make custom firmware images using the Image Builder, that would be very convenient to have for us too.
here the site http://meshkit.freifunk.net/ here the source https://github.com/weimarnetz/meshkit setting it up is a bit beyond my abilities though)