I would say, from my experience, it giving too many options to prospects can lead to lower conversion rates. I see better results when I focus my communication with them and give prospects a single, crystal clear, next step.

This is much needed and something I miss from my old CRM. If people need a visual, I've attached a screenshot of my old scheduler.

This!! For example I have a 15min, 30 min and 60 min general appointments and I'd like to let the client choose how much time they need, depending on their question/challenge. In Dubsado I could group these together under one link to send to the client.

Couldn't agree more. This is essential.

Maybe you can create a small landingpage with the different time slots on your website and link to the meetings from there?

Really want this.

This would be super helpful, that way I could include just one link in emails sent to prospects and clients, and they could choose the type of meeting & length they'd like to schedule. Calendly handles this really well.