No, the OOC is not ruining the development of this team, that's ridiculous. Since their glory days, UConn has always played at least 5-6 awful teams each season and quite frankly, every top conference team does too.
If you look below, the comparison from previous years isn't that different. If you take out two cupcake teams (UNH and Morehead State for this example) and replace them with Northeastern and Vermont, the KenPom average changes from 186 to 156, which is very similar to the average OOC of what the UConn 2011 championship team faced back when they were in the Big East.
The argument that I do understand and would like to explore is: while the AAC isn't as good of a conference as the Big East was, replace some of those 250+ teams with some more challenging local mid-major teams, like Northeastern, Harvard, URI, Vermont, etc.
2019 OOC - 186 KenPom average
15 - Florida St
18 - Villanova
26 - Syracuse
35 - Iowa
54 - Arizona
237 - Cornell
247 - Drexel
259 - UMKC
260 - Morehead State
280 - UMass Lowell
319 - Lafayette
324 - Manhattan
340 - New Hampshire
2011 OOC - 150 KenPom average
5 - Texas
7- Kentucky
27 - Wichita State
45 - Michigan St
62 - Tennessee
71 - Harvard
128 - Vermont
233 - Stony Brook
268 - Coppin State
287 - New Hampshire
324 - Fairleigh Dickinson
339 - UMBC