This was a content conference for digital marketers. Digital marketing is a very broad field as you can see from the talks. I should think the fact WordPress + WooCommerce weren't discussed could be put down to them not being the focus of this particular event. The organisers didn't include a Woo keynote – if they had perhaps there would have been more discussion about Woo.

I go to plenty of digital marketing events where WordPress isn't mentioned because there's only so much you can fit into one event. It doesn't mean the attendees don't know how to use WordPress and/or don't find it valuable.

Not 100% sure on the definition of marketers here, but I presume by this you mean everyone who is not a developer by trade. It's incorrect to say people who are "marketers" aren't technical enough to use WordPress – that's simply not the case. It is no more difficult for a user to set up managed hosting with an SSL certificate as it is to set up a Squarespace account. I wouldn't class this as fussing with tech.

Yes, of course a strong knowledge of code lets you do more with WordPress – but you could say the same about anything.

I don't know how to use Shopify because I never have before. Someone may not be familiar with WP, but that doesn't mean it's too difficult for them to use. Just because someone doesn't currently use a tool (or chat about it to you at a conference), doesn't mean they wouldn't know how if they gave it a go.