“ecosystem” is a misleading term here. There is no “ecosystem” in CS, market giants explicitly make decisions about what their product policy is and rarely budge on them out of goodwill. Ecosystem implies that we implicitly lack a large degree of control and are only observers. That may be true for cutting edge research (only sometimes from a certain perspective), but hardly the case for when a company wants to create jails in their software for their clients. Or refuse to release firmware for a wifi card that they don’t even sell anymore. Those are gardens meant to trap users in. The garden of the GNU project is all unapologetically libre software meant to prevent users from endangering themselves with nonfree software.
The GNU project never “allowed” non-free components, but they will always exist. The goal is to obtain a fully free operating system on all levels. It’s okay to use proprietary software for the purposes of study and reverse engineering (a la using UNIX to develop userland/kernel). What’s not okay is to stop agitating for more freedom.
The current GNU/Busybox + Linux desktop is virtually a complete operating system, but is held back by blobs and users advocating for proprietary software (users complaining that proprietary “X” doesn’t run on “Linux”).
We get market share by being more free, not by making ruinous compromises.