I've used their WinPatrol program for many many years. I know that the original author of the software did transfer updates, management and the business in general to another person/company that he'd hand-picked. It could have been a glitch that you didn't get a reply.. they've always been very responsive in the past.
As far as some companies utilizing the firewall built into Windows.. yes, with the basics covered and all the structure available in the Windows 10 Firewall now, even Trend Micro has found they can start with it as a base and incorporate everything they want to modify it to their standards. I rather see this as a good thing and it also keeps from having resources that would probably be loaded to a degree no matter who's firewall you use, from being duplicated and taking up that much more memory.
Personally, I've had very good results over the years using a combination of their WinPatrol product, Trend Micro Internet Security and, most recently added the Malware protection that Acronis has available for free -- I feel better knowing that I have eyes on things that take a couple of unique approaches towards keeping my system safe. And, that particular grouping meshes well together without fighting each other.. they compliment each other's abilities well.
Anyway, I hope that the lack of a reply from WinPatrol was only an oversight. I've always kept them well regarded for having that type of foresight and dedication.
-Myr
.end.trans.