I am planning to fill out the last survey, and I was hoping people would advocate for their views on answers here. Want a change? Persuade me (and others) to answer the survey that way
I don't think I can persuade you

but maybe you already agreed with something but it's slipped out of your mind, so let's try...
1- I would like Humans not to be used as "the race for those who want a simple race", because we already know that the same idea for classes (i.e. "those who want a simple class should play Fighter, therefore let's make the Fighter simple") has always failed. People want to play a class or race because of the general idea (including the tactical/mechanical concept sometimes), but not because "it's simple". That maybe works once per player, after that each race should be interesting on its own.
PROPOSAL: give Humans something different than +1 to all scores, if we want them flexible i.e. "generic" let's give them a pool of things to choose from (feats, skills, proficiencies, traits, even +1 to some stats...), and instead make the current "+1 to all stats" a sort of non-race option for beginners, in the sense that they can get these bonuses instead of getting the bonuses from a race, and then freely say "I'm an Elf" for story purposes.
2- I would like Saving Throws from spells and monsters abilities to have a more even distribution against all 6 ability stats. Currently most spells require a Dex/Con/Wis ST, very few requires Cha/Str ST, and basically no spell require an Int ST.
PROPOSAL: change all Illusion spells ST to Int, all charmes and dominations to Cha, all paralysis-type to Str.
3- I would like the so called apprentice-tier to really represent apprentices. Apprentices do not specialize yet. Subclasses are specializations. Therefore, subclasses should not start at apprentice levels.
PROPOSAL: move the choice of subclass up to 3rd level for all classes (including Cleric's domains). Furthermore, "dipping" into an another class and not be able to pick a specialization too soon makes more sense.
4- I would like subclasses to grant at least ~25% of all the features of a class. Currently some classes have subclasses that grant features only 3 times in the course of 20 levels, and sometimes end granting features at levels as low as 10th. This means that there is very limited "room" to fill with subclasses features, which will make it hard to capture the feel of many subclass concepts, especially later in supplements. Also, not getting anything from subclass after 10th level means it's impossible to design subclasses with signature high-level features for that class.
PROPOSAL: I would like subclasses of all classes to grant features at least at 5 different levels (in the course of 20 levels), starting from 3rd, and the last not earlier than 17th-18th. Move some non-essential features from class to subclass.