Its not uncommon. The main tech at my shop has only impact sockets in 1/2 drive, and primarily chromes with impact swivels in 3/8.
My 1/2 stuff is mostly impact... Metric and SAE deep and shallow in impact. I only have chrome shallows.
My 3/8 stuff is a mix of both. I have Metric and Standard, deep+shallow in chrome. I have Metric Deep and Shallow impacts, and Shallow SAE impacts.
1/4 is all chrome
A good chrome socket should handle a normal 3/8 impact fairly well, but an IR ti or Nitrocat will lay a beating on them, so I just went for Impacts. It is alot more conveniet when you can just grab any socket and impact it rather than saying "oh damn, let me look for the impact"
If your on a budget, but Impacts in 1/2 and Chrome in 3/8 and 1/4
Jim