Because it’s an old topic that was covered pretty thoroughly last year. Because there’s nothing significant that has changed about that. And because it’s not even true anymore—if it ever really was.
When I moved from my old 2009 17-inch MBP to a new 2019 16-inch MBP late last year, there were very few apps that I had to replace. The biggest one was Adobe Creative Suite—I’ve been resisting moving to Creative Cloud for a long time, because I don’t like subscription-only software, but CS 6 is only 32-bit. MS Office needed an upgrade because I was running Office 2011 (and that only because there is no good alternative to Excel). I was still running a 32-bit version of BBEdit. Also an out-of-date version of Moneydance. Those were the major ones. And those were all cases where I simply hadn’t kept up with paid upgrades because I was running a ten-year-old MBP on Sierra and didn’t really need the upgrades at that point.
Out of nearly 300 apps installed in the Applications folder on my old MBP (counting Adobe Creative Suite as only one for simplicity), a grand total of 45 were 32-bit versions—so right off the bat, less than one-sixth of my software was affected at all. Of those 45, 25 had 64-bit updates or paid upgrades available that I simply hadn’t bothered with yet.
So 20 out of 300 apps were incompatible and did not have compatible upgrades—roughly 6.67%—back in December 2019. Most of those twenty were old games that I don’t play often anyway (I do most of my game-playing on my iPad or my phone now). Of the others, maybe three got used more than once a year, and only one of them have I still not found a satisfactory replacement for (and I’ve actually been looking for one for several years, because the app was discontinued a long time ago, and I’ve been lucky that it still worked at all).
Yes, I spent a few hundred dollars on the upgrades I needed. It’s an expected cost of having a computer; I had simply been fortunate enough to be able to put it off until it wasn’t a financial hardship (software upgrades were budgeted into my planned expenditure on the new MBP). You buy upgrades, make do with legacy versions, find alternatives, or do without. That’s reality.
I know there’s a sizable chunk of vertical-market and niche software that didn’t have 64-bit versions available when Catalina was released and probably still don’t, but that’s a relatively small percentage of installations, and they’re definitely not things that would be found “on a typical computer”. Unless one is dependent upon legacy software (for example, I’ve heard reports of problems for people trying to move old workflows out of Office 2011, because Microsoft can’t release a new version of anything without breaking things that didn’t need changed), most users have little reason to worry about incompatible 32-bit apps on Catalina.