No IBM "product" can work without some 10 consultants meddling with it and/or huge amounts of red tape
It had a a lot of nice features. The network stack was very nice (compared to trumpet(?) or whatever Windows used to have back then which had gaping holes). Multitasking. Rexx as the system interpreter...
The nails before that were lack of OS/2 native apps, since OS/2 could run DOS and 16 bit Windows software, companies didn't bother writing OS/2 native software anymore since they could write DOS or Windows and sell it to OS/2 owners in Win-OS2 mode. Lack of programming language support except for IBM VisualAge products.
But third party driver support, Microsoft did it better than IBM and got more OEMs to make Windows drivers and not make OS/2 drivers. When Microsoft still supported OS/2 with IBM they got third party driver support for it, after Microsoft abandoned OS/2 the third party driver support dried up.
OS/2 Warp holds a special place in my geek heart along side BeOS. The only OSes I've ever used that just did things that didn't seem possible in the contemporary operating systems of the time.
I remember installing a program on my later Amiga (a 3000 with a 68030/ MMU) that made the first page write only. This definitely improved stability...
Windows NT was the Microsoft operating system that replaced (in its lineup) the joint MS/IBM OS/2, so that's not surprising. (Windows NT began development with the intent of being OS/2 3.0.) So its not really surprising that "Windows" didn't beat OS/2 at its strong points until that version, since the prior versions were intended for lower-end markets with OS/2 being the higher-end OS for Microsoft.
After that I worked at a tools company that had OS/2 2.X systems on PS/2 systems and we upgraded them with Kingston Microchannel cards that added more RAM and used IDE hard drives. Using Client Access/400 for DOS/Windows ate up the 640K of DOS RAM, but in OS/2 it used the memory above 640K so more of it was free. It was the AS/400 client software that we needed to access DB2 databases and other things. We also used Token Ring and was a big IBM shop. Until management decided to switch to MS-DOS 6.X and Windows for Workgroups 3.11 with MS-Office 4.3 to get everyone on it standardized because they got a bulk discount from 800 Software. The IBM PS/2 systems got replaced with Compaq and Gateway 2000 systems that were cheaper. We also used Windows NT 3.1 and switched to Windows 95. I was downsized in 1995 before the Windows 95 roll-outs.
But I had OS/2 experience that got me a lot of job interviews, like Enterprise Rent-A-Car used OS/2 and I almost got hired there. OS/2 was phased out and in 1995 I couldn't get OS/2 3.0 Warp working with my 486DX PC clone so I got Slackware Linux instead. OS/2 3.0 Warp lacked driver support for certain hardware and that was the downfall of OS/2 from 1995 and on.
Things got easier with MS-DOS 6.X and memmaker but MS-DOS 5.0 I had to managee upper memory by hand.
I had to configure adapter card ROM memory to fit into the same 64K C000 block so that there was 64K free D000 for an upper block to more the network drivers into to keep more conventional memory free.
I also ran the Danish OS/2 BBS and since it haf one of the largest collection of OS/2 drivers and OS/2 software I even helped create a redbook with CD's of drivers, all at the age of 25!
I loved the OS and had great fun working with the lavs in the US, the engineers really wanted OS/2 to succeed when management did not.
The 'best' client called christmas eve announcing that end of the year their datacenter UPS will be replaced and last time the power went out their $(very important piece of banking infrastructure) wouldn't even boot. Well, at least jobs like that paid good money.
But for fun and entertainment I think it's a great idea.
LOL.. you can pretty much guarantee this is why it's happening, and why there is funding for it.
I see competition as a good thing, you got two OEMs trying to offer a modern day OS/2, of course they are going to work to make their own version better than the other one.
It is not uncommon for employees to leave one company to form another that competes with the former company. Usually they had a different vision than the managers had, and want to take OS/2 into a different direction than Serenity is currently doing.
I hope they offer open source bounties for porting open source programs to OS/2 from Linux and Windows and other operating systems. I hope they do the same for drivers to get modern hardware support.
OS/2 runs faster because it has a smaller Kernel than Windows 10 does and it was designed for earlier systems to use less system resources.
Of course, I still have an Ecom Station VM for purposes of playing Galactic Civilizations. Stardock Systems started our on OS/2.