I'm the Andy listed at about minutes 9-11. But basically, the "typical campaign" of 5e says you get about 1 consumable per level and 1 permanent, number changing magic item every 4 levels. So if you're handing out more magic items than that, your campaign might have to really ramp up difficulty. Less than that, you might need to pull back. Adventurer's League tends to double the numbers, so they often have some issues at higher levels due to PC power levels.
A 10th level PC with 5 magic items will be able to handle a range of combats per day that a level 10 PC with 0 will start dying on. The way this commonly shows up is that campaigns default to not having 6-8 combats per day.
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A 10th level PC with 5 magic items will be able to handle a range of combats per day that a level 10 PC with 0 will start dying on. The way this commonly shows up is that campaigns default to not having 6-8 combats per day.

Dragon Talk: #328 - Aliza Pearl, How To DM on Magic Items
01:39:30 - Welcome 2022 with Greg & Shelly as they ring in the new year! Later, we welcome back freelance author and developer Teos Abadia for another edit…


D&D 5E - Magic Item Math of 5e
How many magic items should a typical 5e campaign have per PC? DMG, bottom of page 133: Over the course of a typical campaign, a party finds treasure hoards amounting to seven rolls on the Challenge 0-4 table, eighteen rolls on the Challenge 5-10 table, twelve rolls on the Challenge 11-16...
