I bought the same 2018 Kymco Like 200i (matte black) at the end of July and have less that 350 miles on mine. Unlike you, I did not have a motorcycle background, so take my answers with a grain of salt:
1: Oil change...The owners manual puts a lot of emphasis on the 600 mile service and oil change, but I note there is also and oil change recommended at 200 miles. How many do that oil change? With only one quart needed, the cost is minimal. My dealer is less than 10 miles away and I did take mine in for the 200 mile maintenance listed in the owner's manual. They were surprised to see me. I told them I did not want to violate the warranty, so they did the maintenance ($160.00 in SoCal) per the checklist in the manual. As a new rider and non-mechanic, I wasn't bothered by it. Many members here will encourage you perform and document your own self-maintenance actions. My vote is to do what is necessary to keep the warranty alive.
2: Oil used...Honda sells a HP4M oil that has "Moly" in it...the Moly is a friction reducer. Seems like it should be a good choice for the Kymco. Anyone using it? Haven't crossed that bridge yet, but there are plenty of helpful members to answer. As an owner of the same model, I am interested in member responses.
3: Ride...the ride seems unduly hard, as did the Forza and a Honda Refex 250 before. Anyone found a way to soften things up? Some of the problem is probably me...my current riding weight with gear is less then 120 pounds. As a member of the "chub club" and a new rider, I don't know what a hard ride feels like. When I took my scooter in for that 200 mile, maintenance, I did ask them to adjust the tension in the springs beneath the seat. In my case, I asked them to maximize the setting. You might want to check to see where your springs are set and adjust to suit your ride, load, and streets. Still, I do find my rides smooth until I hit the aberrant manhole cover or crazy San Diego pothole. You may also find some owners protest the stock seat on the Like 200i for discomfort and padding. Perhaps, better padding could soften up your ride.
4: Parking brake and side stand safety switch: or lack there of! I had thought those came under some Federal requirements. Apparently not!? Like you, I expected the bike to not start with the kickstand down. Just to compare notes, mine will start with either stand down.
Welcome aboard. Enjoy your scooter. I love mine. If you are able to browse through my posts (by finding my profile - click on my name), you will see pictures of how I customized mine.
Have fun and we'll see you around the site.