There is nothing wrong with that method, until you want to change the paint color and then have bleed from the paint into the grout, which as you know is more difficult to remove - many people would not worry about such things.Methods to remove the existing grout have been stated already (and yes, you might be able to cover it up with a trim piece).

.)- Color scheme development/paint selections- Lighting selection and purchases- Revise electrical placement, as needed- Selecting and purchasing plumbing and appliances- Creating drawings or floor plans, as needed

When you look at a place, what sources do you use to plan colors, material types, layouts (if a floor plan needs redesigning)?

.- Even buying houses in HOAs can be h***, re lawn mowing, house maint, painting your colors, tenant leaves camper parked in drive getting you HOA fines....In short;  what out for HOAs, avoid is a good business model.  ...

I learned about paint colors and how I had no business picking them. 

Currently updating the cosmetics of the property from paint colors to landscaping.

I am seeeriouuuusly challenged when it comes to any and all types of decorating, choosing paint colors, accessories, everything. 

White walls the color of oak cabinets, etc.

Mold and mildew come in lots of colors. 

Don't try for any sort of colored caulk for this application.4.