Certainly not, ZX-81, ZX Spectrum 48k and CBM-64.
The CBM-64 was the most reliable probably because it was a custom made job, even though the shape was appalling (I preferred the look of the VIC-20 tapedrive).
Also we had HP "desktop calculators" that used cassette tapes. Note, that's a huge calculator which covers the desktop and included an HP-IB bus.