The greatest limiting factor of old browsers is the lack of TLS 1.2 support.
The old Opera didn't seem to understand a lot of modern sites, even those on my no-internet internal network. But yeah, I lost a lot of services to SSL/TLS support not being there, one of the reasons I started dumping Windows stuff for Linux years ago.
I can't complain, a couple of RPis do natively what a stack of Windows servers did with kludge. Only thing that agitates me is that all of the IT gear I've collected over the years in my job and travels usually only has support for Windows. I'm not sure why that is, I guess they're not intelligent enough to provide Linux functionality. Fortunately, it's usually pretty easy to scrape something and make it work better than their crap.
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