Efficacy, interoperability, extensibility
Choose what you build on in that order. Most teams invert it and pay for years.
Four times across four organizations, the highest-leverage move available was changing what the team was working with rather than what it was working on: an email platform migration, a storefront upgrade, a replatform off a custom headless build, new measurement tooling.
None of those read as strategy on a plan. All four were the strategy, because in each case the ceiling on execution was set by the tooling and no amount of better campaigning was going to raise it. One migration contributed 40% list growth. In another case the insight was free and obvious, to segment on what customers had revealed about themselves across a business’s other properties, and simply unexecutable until the platform could express it. Once it could, channel revenue grew 60% year over year while output scaled.
If that is how much rides on the stack, then how you choose what goes into it is a strategic decision rather than a procurement one. Three criteria, in this order.
Efficacy
Does it do the core job better than what you have today?
This is first because it is the only one that can’t be recovered later. A platform that connects to everything and does its actual job badly is a slower, more expensive version of the problem you started with, and you will spend the next two years building around the gap rather than through it.
The trap is that efficacy is the hardest of the three to evaluate before you buy. It shows up in use, under load, on the unglamorous edge cases, which is exactly where a demo doesn’t go.
Interoperability
Can data move in and out of it cleanly?
A tool that works but can’t talk to the rest of the stack creates a second source of truth, and a second source of truth eventually costs more than the tool saves. Everything downstream inherits whatever it can’t export: segmentation, measurement, reporting.
Interoperability is second rather than first because a well-connected tool that doesn’t work is still a tool that doesn’t work. Integration multiplies capability. It does not substitute for it.
Extensibility
Can it bend as the business changes?
This matters, and it matters last. Extensibility is a bet on a future you can’t specify yet, and it is the criterion most often used to justify buying something that fails the first two. Roadmaps are easy to admire and integration lists are easy to count, so teams evaluate what is legible in a sales cycle and discover efficacy after signing.
Why this compounds
Infrastructure work is unglamorous, hard to attribute, and easy to defer, so it loses every budget argument to something with a campaign attached. That is precisely why it accumulates as unrealized leverage. Nobody else is competing to do it either.
Capability constrains strategy. Raising the ceiling on execution is usually cheaper than out-executing inside a low one, and it is the one investment that makes every subsequent plan better rather than one plan better.