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What on hardware?
This is what I'm running:
Screen Shot 2020-05-03 at 7.55.47 PM.png

No problems with the above and software that I have installed. The only difference I see is that the computer is running a little faster. Lucky? May be. I hope it stays this way.
 
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Apart from a notification issue with Mail (it sometimes decides to play the new mail sound a few minutes after mail arrives, even if I've already read and deleted it), 10.15.4 ran without issue on my two laptops.

To help you gaze into the future, I'm now running 10.15.5 (beta) and it's just as good.
 
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2018 Mini
2018 15" MacBook Pro
2012 Mini

All running 10.15.4 No real issues, the 2012 Mini and 2018 MacBook Pro were upgraded to 10.15.4 and then supplemental upgrade. These two displayed the notification badge on update however this was quickly resolved. The 2018 Mini came with 10.15.02 and has had no problems.
 
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Running 10.15.4 on early 2013 MBP with seemingly no issues. I find the fan comes on more lately but I suppose that could be caused by something else.
 
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