I believe Angelo was referring to PlayOnMac, not Subsurface. It appears that PlayOnMac is 32 bit (at least for now), so you wouldn’t be able to use on Catalina to run Windows software. Subsurface is 64 bit, and There is a Mac version, so will run just fine on Catalina.
True.
But, unfortunately, I had problems also with many other software I use for work, so I had to switch back to Mojave.
In practice Catalina requires that the software is recompiled with all the required "safety" features which are now mandatory.
And many "legacy" hardware, such as a number of excellent audio interfaces which are still using Firewire, are simply not supported anymore.
It seems that Apple, year after year, is going against the loyal user base of professionals of audio and video, and is targeting people mostly interested to the world of "apps" available for the iPhone.
To the point that at work we are not buying Macs anymore, since when they dropped the availability of useful ports such as HDMI, USB-A and Displayport, and unified to USB-C, which requires a number of adaptors.
And the next gen appears to be based on Arm processors, so running Windows programs natively will be impossible, making the machine unusable in our field of work, where many software are Windows-only, albeit working happily, till now, either using Playonmac or Bootcamp...
While in the past I suggested to many Windows users to switch to Mac OS, after the release of Catalina, and considering that a new machine cannot be downgraded to Mojave, I am not suggesting anymore to Windows users to do the jump.
This being the situation, I had never suggested to the OP to upgrade form a Windows PC to a Macbook Air (a machine which was not to be bought even with previous versions of Mac OS, in my view).
And if Apple does not fix Catalina soon, making it usable for us audio professionals, I suppose I will start predicating Apple users to switch back to Windows.