Every "Shopify can't" or "migration will" objection is execution-handled, not a platform property, with the real edges conceded. Here's each claim against what's actually documented.
01Claim"You'll lose your SEO."
RealityA mishandled replatform loses rankings, not a replatform. Shopify's fixed prefixes change nearly every .html and category URL, so a 1:1 301 map (crawled live, reconciled against url_rewrite, loaded before launch, held ≥1yr) preserves equity. Google says 301s don't cause a loss in PageRank, and Plus holds up to 20M redirects.
02Claim"Shopify can't match Magento's flexibility or B2B."
RealityShopify Plus reaches native parity on most DTC and B2B features and wins on operational burden (no hosting, patching, or PCI; upgrade-safe Functions). It loses only at the edges: arbitrary server-side code, four B2B primitives (negotiable quotes, requisition lists, deep role hierarchies, revolving credit), multi-brand containers, and capped filtering.
03Claim"Migration means downtime."
RealityNear-zero storefront downtime. The new store is built and QA'd behind a password page while Magento keeps selling; cutover is a DNS change plus a short Magento maintenance-mode freeze for the final delta, not an outage.
04Claim"Just run the automated importer."
RealityThe most dangerous true-sounding claim, and on Magento it's worse: Shopify's own first-party importer can't even ingest Magento. Third-party tools move records (roughly 30% of the work), not the theme, redirects, extensions, or B2B structure. The importer is one step of about twelve.
05Claim"You'll lose your extensions and custom features."
RealityThe PHP code doesn't port, but the capability is re-expressed as Shopify apps, Functions, metaobjects, and the Admin API. A per-extension capability audit classifies each as native, app, rebuild, or drop. Most features survive; the code doesn't.
06Claim"Magento is cheaper because it's open source."
RealityThe license is free; the platform isn't. Self-hosting, security patching, PCI scope, the full server stack, and (for B2B) the paid Adobe Commerce license are all yours, and the license grows with GMV. Shopify folds hosting, SSL, and PCI Level 1 into the plan fee. False on total cost of ownership.
07Claim"Our B2B shared catalogs and price lists will just move over."
RealityPrice data extracts and per-variant fixed prices bulk-load, but catalogs and price lists are built first via the Admin API: Matrixify only writes into existing catalogs. The gated this-company-sees-these-products-at-these-prices logic is re-architected, not copied. Plan it as a build line.
08Claim"We'll keep our negotiable quotes and approval rules."
RealityThere's no Shopify quote object to import into. Quoting is rebuilt on draft orders or an app, the multi-tier PO-approval engine is rebuilt (Flow, draft orders, or an app), and historical quotes are reference data only.