That statement might be a little too categorical. The line between digital and analog is getting very blurry - SATA interfaces are, practically speaking, a bit of both analog and digital design. Ethernet has always been about stuffing bits through a noisy, imperfect transmission line, and 1G and 10G (and 40G) Ethernet just make it that much worse.
The good news is that even cheap 'scopes can also serve as a frequency counters, voltmeters, and some cheaper models can also serve as spectrum analyzers (and practically all of the expensive ones can). Take a look at how good the $200 USB-connected 'scopes are now.
If you're making robots or UAVs, you may not need a 'scope, but if you're making ham radios then you're going to want one. Get a cheap USB one so you can also use it as a spectrum analyzer.
(and if you get a chance, play with a Tektronix 4100 series - it's basically a logic analyzer that happens to have a 4-channel analog 'scope built in. Analog events can serve as the trigger for the digital side (and vice versa), and it comes with two decoder ROMs priced in - it can snoop CANBUS, for instance, and trigger the analog side on particular CANBUS messages. Not something everyone needs, but if you need it, you need it in a big way.)