It's certainly nothing to be ashamed of, the reliance of using shortcut tools is not a good habit to get into.
I mean, if you look around this site you will see some styles/extensions that have been submitted and within a month of being validated have 3 or more update fixes.
Some of these fixes are for the simplest of things that could have been spotted with a thorough check before submitting.
A few even love to use !important in their CSS, I've been doing styles for over 10 years and started off with platforms that only allowed CSS edits so quickly learnt that 99% of the time there is a way to avoid using !important.
Take the use of "emulators" some people test their work and say "yep it works" - if you tell them it doesn't work... they'll say your device is at fault, because the emulator never lies.
I test my work with a Windows XP laptop, a Windows 7 laptop, a Windows 10 laptop, a Windows 8.1 pc using various new and old versions of Chrome, Firefox, Internet Explorer and Edge,
Then for portable devices a Nokia Lumia 530 Windows phone, a Samsung Galaxy J5 phone, Samsung Galaxy Tab 4, a HP Stream 11 Notebook and an iPhone 7.
I use emulators too but actually using a handful of devices to properly check gives customers more confidence.
Another example is there is an extension on here somewhere where the author swore that it was not conflicting with an extension, the chap installing it said there was a problem, even a member of the phpBB team pointed out that there was an problem with the authors extension and even pointed it out to him - the author was not interested in fixing it.
An appalling attitude, here install some of my work - it works fine... find a fault? oh that's not my problem... I won't fix it for ya, you're on ya own.
Some of these people are charging money for their work too.
If someone installed a HifiKabin extension and found a problem with it - even if he's busy he'll soon get back to you with a fix or tell you how to fix it - this attitude would certainly inspire someone to pay money for his services.
class="headerspace" I'll trust the result of the html editors find in folder setting but for anything more important than that - I'd still rather do at least a quick manual check myself just to be certain.
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