Both WhatsApp and Signal show the same amount of chats to me (9 for both). WhatsApp does show a small sliver of a tenth chat, but it's not really properly visible. There is a compact mode for the navigation bar in Signal, which helps a bit here.

From what I can see there's slightly more whitespace between chats, and Signal uses the full height for the chat (eg same size as the picture), whereas WhatsApp uses whitespace above and below, pushing the name and message preview together.

In chats the sizes seem about the same to me, but Signal colouring messages might make it appear a bit more bloated perhaps? Not sure.

The problem is actually further - it's that they push people to use Signal on mobile.

In the official desktop client, there is no option to register (even though it would likely be not that hard to add a box accepting a verification code), they tell you to use it in the mobile app instead. All while far from all phones can have privacy-respecting OSes installed on them at all.

Yes, there are ways around (Signal-cli or an Android VM - and even then you have to use Molly since the official client requires you to scan a QR rather than following a link). But arbitrarily directing people to a platform that is harder to make private is nonetheless weird.

Is this some Network Allowed problem that I'm too Network Not Allowed to understand?

Spell check? If you mean smartphone keyboards, then yes, the non-foss ones are keyloggers. One of my side-projects is a privacy-oriented keyboard, but there are many out there that don't require network calls to google or apple.

Maybe the US government (or even "deep state" or something) has realized that making everyone use insecure devices for easier surveillance is as smart as forbidding fire exits so that people would be easier to arrest.

I haven't heard too many bad things about Signal.

Various dictatorships want to simply read correspondence because the social graphs producing actual value and keeping stability in our world, and also protecting their embezzled value stored abroad, are all abroad too, and they won't hurt these. Some politicians in the west want to invade privacy for the same reason - what they embezzle is stored in ways unaffected by insecure communications in their own countries.

But if you are part of some establishment, even if not well-meaning, you are interested to protect the system from outright erosion, meaning secure communications.

Other than that, WhatsApp and FB Messenger are owned by Zuck and he's become too big to tolerate, Telegram is an African brothel with no protection and plenty of diseases, and in general it's all corporate around.

Let's please also remember that there are people of various views and interests in every organization and force.

I find it intriguing that the people will scrutinize messaging platforms such as Telegram, and explain in detail how one should not entrust their messages' encryption keys to these services. Yet, these same people seem unable to comprehend the concerns regarding Signal server having access to phone numbers of its users. The fact that these people are able to perceive potential vulnerabilities in one platform while remaining oblivious to similar concerns on another highlights that their arguments are more ideological than rational.