No, that's cool. I figured that's how it would be. I had to ask. Splint it is!
However, as far as Plate is concerned, this is probably why they have the Doff/Don times, and how you get exhaustion if you wear your armor through the night. However, I will assert that the same problems you bring up would be there if they wore a chain shirt, chain mail, or even leather armor. Armor just wasn't comfortable to wear. Splint Armor would be no better than full on Plate in that regard.
However, it would add a bit of realism if we had to deal with the consequences of wearing armor for extended periods of time, and had to deal with the Don/Doff rules. Say, if you wear your armor for more than a certain number of hours, you have to make a Con save or suffer a point of exhaustion. Make it, like, 4 hours for heavy, 6 for medium and 8 for light? Basically, you just can't wear your armor all day without having to roll. Assuming a 16 hour day and 8 hours of sleep, if you wore your armor through all 16 hours, Light armor would have to roll once (8+8=16), Medium would have to roll twice (6+6+6=18), and Heavy would have to roll three times (4+4+4+4=16). Increase the DC by five every roll, and Light Armor has more of an advantage than Heavy.
It's something more to keep track of, but it's not like it would slow us down anymore than we already are in Play by Post. I think I'm the only one who wears Heavy Armor, anyway. Not sure what Angis wears.
Also, using the Don/Doff rules would actually be a good reason to get the new Invocation for Warlocks in the UA, Eldritch Armor. It allows you to touch a suit of armor not worn by anyone else, and instantly don it (so, you're iron man.) You are proficient with it when you don it.
This is mostly for those Bladelocks who don't normally have access to Heavy Armor, and forces them to put more into Strength than Dex. Titus is already proficient, but he does have the Strength, and if we're going to use these rules for being in armor all day, then being able to don his armor as an action, rather than the 10 minutes to Don that Heavy Armor is supposed to take, then he can just not wear his armor, and keep it on his Horse or nearby while traveling. When they're attacked, he can touch it and instantly don it.
It may not be an Invocation I choose to go with, because that's a huge resource used up just to be able to skip a Con save or two, but you never know. It certainly would make it more appealing.
