Many people say that SimpleX is not ready to replace the likes of Whatsapp, Telegram and Signal yet but noone specifies exactly what features are missing.
I get that public key cryptography is confusing for the average people but there is no UI fix that is getting around that obstacle if we want people to make informed choices on what platform/protocol to use for communications.
The same thing applies to decentralization - people just need to understand that the trade-off they’re making for communications’ resilience is the comfort of an online addressbook.
Although I admit that there are certain UI elements that could be made better (for example the nickname setting could be stylized a bit better so people can more easily change the names of their contacts to something more familiar), most criticism towards SimpleX comes from people being a bit lazy and not reading the manual before using the app.
TL;DR: I don’t understand what features are missing from SimpleX.
It isn’t as hard as people imagine it to be. For starters you could watch a few entertaining videos by MentalOutlaw or listen to Opt Out and Watchman Privacy podcast.
When you feel more at home with the terminology and understand the basic process behind cryptocurrencies in general and Monero, you could get a wallet, look some at some of their recommended guides, buy some Bitcoin at a decentralized peer-to-peer (P2P) exchange, trade it for Monero and badabim badaboom - you now have Monero.
I recommend either Haveno Reto or Bisq. Nevertheless, always do your own research and make your own choice. This is a good place to start.
You can use centralized exchanges as well as they make the process a bit easier but then you have to KYC yourself. Which isn’t a big problem because when you trade Bitcoin to Monero, all following transactions are anonymous.
If you want to go hardcore from the start, you could use decentralized P2P exchange to get Monero for cash but this is a bit more advanced and comes with a premium.