I haven’t had any issues using the card in shops. I’ve never had anyone question me about it not having a name, nor have I ever been asked for ID. It’s pretty lax here when it comes those things.
Chip and Pin is prevalent throughout Chile (I’ve been living here for several years now). The only issue I’ve had is that in some small towns cash is still king. However, you are not too far away from an ATM (but only CLP200,000 limit allowed each day max). And remember you can only take out £1000 per 30 days, but that’s due to Monzo, not any limits by the banks here.
Lider, Santa Isabel, Tottus, Jumbo (the big four supermarkets) all use chip and pin now, and surprisingly Contactless in some stores, but strangely after you tap on the reader to pay it asks for your pin. So not really contactless in my opinion.
Hope this helps!