The only hindrance to the plan is Phyllis's disapproval of it.
2 prevention, curb, limitation:
The presence of police cars serves as a hindrance to speeding motorists.
Advanced English Dictionary
+noun 1[C, usually sing.] ~ (to sth/sb) a person or thing that makes it more difficult for sb to do sth or for sth to happen: To be honest, she was more of a hindrance than a help. + The high price is a major hindrance to potential buyers. 2[U] (formal) the act of making it more difficult for sb to do sth or for sth to happen: They were able to complete their journey without further hindrance. See also-HINDER Idioms see LET n.
Collocation Dictionary noun
VERB + HINDRANCE
Having a car in the city might prove a hindrance.
(formal) The cook needs room to get at the cooker, sink and cupboards without hindrance.
| ~ to
The new regulations are actually a great hindrance to teachers.
without let or hindrance
Random quote: We are what we repeatedly do. Excellence, then, is not an act but a habit.: Aristotle