"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.
Because what you mentioned is ahistorical and based off reactionary history by bad actors.
Rms draws the line a GNU because GNU stands for a free operating system, which is what the GNU project is aiming towards. If this were purely a discussion about technicality, then we would be wise to let the matter drop, but that's not whats at stake here.
You can, you literally can and it would be better that way to accurately describe what operating system you're running. The shortest possible name is GNU, but that would be unfair to the contribution made by the linux foundation and the fact that multiple kernel projects do exist: so the name is GNU/Linux.
His essays on the topic which are publicaly accessible from the GNU website do discuss this.
Rest assured that rms does not doing this out of ego tripping. Maybe you should tease Linus Torvalds for calling his kernel linux and the ENTIRE operating system linux. Torvalds is a multimillionaire who has used an apple M1 laptop. Stallman has never budged on libre software and directs his own life by his own stated principles. Call Rms stubborn, but never call him egotistical.
Please read Free Software, Free Society by Richard M Stallman so that this doesn't have to keep springing up anymore. There are very few "linux" comm members who have read the foundational literature in full so I hope you do take my advice.