Most international carriers treat Armenia as a tier-two roaming zone — you get a small daily data allowance, then throttling or a per-megabyte overage charge. Hotspot is often blocked or requires an add-on fee.
Your home network routes traffic through a European hub, adding latency that slows map loads and rideshare requests. The eSIM connects you directly to Viva-MTS, Beeline, or Ucom at local prepaid rates, so you pay one flat price for the trip rather than watching the meter tick each day.
No throttling after the first gigabyte, no carrier-imposed tethering block, no surprise bill when you return home. The eSIM also hands off between carriers automatically, so you get the strongest tower in Dilijan or Goris rather than being locked to whichever network your home carrier has a roaming agreement with.