It doesn't "doze all the time" here, seems like you're blaming Signal when it's your phone's power management software not working as described.
The only people I know that have this kind of issue with Signal are all on Huawei phones, we've configured them and it's worked for a while but Huawei only seem to care about letting Facebook/Whatsapp/Teitter/etc.. run properly.
A bit of it. But it is besides the point: A messenger, that is working reliable and intentionally designed for the masses - does not come with the need, to fiddle with configs, to get basic functionality working.
I do not like Meta, but I never experienced with whatsapp, that someone send a message and this message just vanishes, so the sender thinks he is getting ignored. But exactly this happened way too often with signal.
