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If it’s low privacy needs (ie you don’t have a state threat model), Signal is completely fine. I use it to talk to my friends. I also use Matrix, though federated Matrix isn’t the best for privacy either due to the amount of metadata that leaks through federation. But federated Matrix is also fine for the kinds of things you would use eg Discord or IRC for.
If you do have a state threat model, I personally think SimpleX is ideal for that, but it doesn’t have as much of a userbase so you probably need people who care enough (eg people actively under threat) to switch to a new platform. Whereas most people I know are already on either Signal or Matrix, and I’m not having particularly sensitive conversations with them either so both work fine.
You can easily get a case with an optical drive slot if you just get an older case. You can fit an older case with more modern components just fine. My current PC case is from 2017 and has an optical drive slot (which is fitted with an optical drive—though I’m afraid I’ve not used it in years…)
As for laptops with ports, they’re out there but you may have to either get an older one or pay more money annoyingly. I wish it was standard for laptops to have ethernet ports. My modern, fairly mainstream trend-following laptop has all the other ports I need (USB obviously, HDMI, and 3.5mm headphone jack).