I think some version of the 80/20 principle applies. If you're smart you can get most of the competitive benefits of gi training (mostly learning how to cope with the other guy's grips/gi chokes) with a relatively small proportion of your time spent in a gi. Of course you will not be as good with gi-specific techniques as someone who trains 100% that way, but if you're gonna go to gi comps I'd definitely do it. The timing of moves will be a little different as well; the cloth often imparts a time lag.
Defense is easier to learn than attack, and that's good for you in this case. Collar chokes are no joke. There are people out there whose main strategy will be to strangle you with your gi, and it's very effective. You don't have to be a master of applying them but you do need to develop defensive reflexes against them. That's the main difference *I'd* be worried about. After that, well, the rest of your defense needs to be pretty technical too; you'll notice it's harder to slip out of things in a gi.
I do try never to use any offensive techniques that rely on the gi, even when I'm wearing one. That's just me.
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