When it comes to "5E is incomplete", I will admit there are some things I wish they had kept from previous editions such as a price list for items. I understand why they didn't - they wanted to remove the expectation that you should have a magic mart - but I do want some items for sale.
But the game is hardly "incomplete" or at least no more so than any other edition. For example if the DM has a wall that can be climbed they need to decide a DC in 5E. In 3.x we had a chart and the DC was set based on the type of wall. But it just gave the illusion of precision because as a DM I decided what the wall was. In practice it just made more work because I had to look at the chart and, based on how difficult I wanted it to be to climb, I had to base my description of the wall on the appropriate construction. If I was improvising it was even worse. That and we were constantly leafing through books to figure out the "correct" way to run something, it could really slow the game down when someone insisted that there were details on how to [insert task here] somewhere and they just had to find it quick.
Ultimately D&D and TTRPGs in general are games of the imagination. Unless you have a very limited scope and tone of game, you simply aren't going to get specifics that hold your hand. Would D&D 5E be better with more charts and price lists? Maybe. But where to draw that line is not easy to answer.
But the game is hardly "incomplete" or at least no more so than any other edition. For example if the DM has a wall that can be climbed they need to decide a DC in 5E. In 3.x we had a chart and the DC was set based on the type of wall. But it just gave the illusion of precision because as a DM I decided what the wall was. In practice it just made more work because I had to look at the chart and, based on how difficult I wanted it to be to climb, I had to base my description of the wall on the appropriate construction. If I was improvising it was even worse. That and we were constantly leafing through books to figure out the "correct" way to run something, it could really slow the game down when someone insisted that there were details on how to [insert task here] somewhere and they just had to find it quick.
Ultimately D&D and TTRPGs in general are games of the imagination. Unless you have a very limited scope and tone of game, you simply aren't going to get specifics that hold your hand. Would D&D 5E be better with more charts and price lists? Maybe. But where to draw that line is not easy to answer.