translation
dont own your own bitcoins use a third party service that can take the coins..

i personally would say for those people that get bitcoins as a wage and spend them on foodler.com and bitcoinstore, meaning the "consumer" class of people, then yes using third party services for weekly amounts is acceptable.

but for investors and long term savers i would say using the proper client with full blockchain and understanding the best practices of backing up and paper wallet funds long term is advantageous.