Why the exported one sheet goes stale so fast
A speaking business changes in small ways constantly. You raise the corporate band after a run of full rooms, you drop a topic that stopped selling, you release the second week of April because a client moved an internal leadership day. Each of those is a two minute decision and a twenty minute redesign if your one sheet is a file.
The worse problem is the copies already out there. Planners forward your file to a program committee, a chapter president saves it to a shared drive, and a sponsor pulls it into a packet. Nine months later someone quotes a fee band you retired and a travel policy you changed. A link does not have that failure mode, because the page everyone opens is the page you edited this morning.
What a committee actually copies out of your materials
Watch what happens after a planner says yes. Someone has to write the program blurb, someone has to fill in a room setup request, and someone has to explain the fee to a finance approver who has never heard of you. If your topic descriptions are laid out as art, that person retypes them and gets your session wrong.
SpeakerOneSheet stores each topic as fields rather than as a picture of fields: a title, a subtitle, three takeaways written in buyer language, the run times you deliver, the group size and the room setup. The committee copies clean text, the program prints what you meant, and you stop finding your keynote described in the agenda as a general leadership talk.
Running both without doing the work twice
Plenty of speakers keep both, and that is a reasonable stack. Use the design tool for what only a design tool does: the printed piece you hand out at a chapter meeting, the sponsor deck, the session workbook attendees keep. Those are finished objects and they should be beautiful.
Keep everything that changes on the live page. A useful discipline is to put no fee figure and no date in any printed piece at all. Print the topics and a link, and let the page carry the money and the calendar. Then the leave behind stays correct for years, and the one thing that must be current always is.