Good point
and I wonder if it is because all the modern equivalents of Lotus123 are Internet things like Facebook, Whatsapp, YouTube which are designed not to make many demands on the local PC because they want to reach as many people as possible, even if their PCs are somewhat antiquated. All the hard work is done in the Cloud, so the PC ends up being a bit like a tv being broadcast to.
Hence the lack of need for an upgrade every two years.